Contemporary critiques of torture can be grouped into two broad camps. In one group are pragmatists (or consequentialists) who object to torture on grounds of efficacy. They argue that torture yields bad intelligence. Innocent detainees will offer spurious confessions to escape their predicament (Pfiffner Reference Pfiffner, Lightcap and Pfiffner2014; Rejali Reference Rejali2007, 462-3, 488-500; Schiemann Reference Schiemann2016; Mayer Reference Mayer2005). Guilty detainees, on the other hand, will tell lies that are difficult to distinguish from accurate information. The false leads extracted by means of torture can overwhelm the intelligence apparatus and can consume precious time and resources (Boorman Reference Boorman2011; Costanzo and Gerrity Reference Costanzo and Gerrity2009, 183). The pain of torture would cause even the most cooperative of detainees to suffer memory degradation so that they would be unable to recall crucial details (O’Mara Reference O’Mara2015). Pragmatic critics further argue that non-coercive interrogation methods that employ psychological insights to create empathy between interrogators and detainees have provided better results than torture (Pfiffner Reference Pfiffner, Lightcap and Pfiffner2014, 138-40 and 145; Alexander and Bruning Reference Alexander and Bruning2008, 83; Budiansky Reference Budiansky2005).

Moral (deontological) critics reject torture for ethical reasons.Footnote ¹ They argue that torture dehumanizes victims, treating them as means rather than as ends (Scarry Reference Scarry1985; Bagarig and Clarke Reference Bagarig and Clarke2005, 599; Fried and Fried Reference Fried and Fried2010, 55). Torture instrumentalizes pain and undermines the victim’s capacity for agency, forcing them to collude against themselves (Sussman Reference Sussman2005, 4-8, 21-29). Victims of torture are defenseless, cannot shield themselves, evade, or retaliate, and cannot know if or when the torture will ever end (Shue Reference Shue1978, 127-30). It strips its victims of all human dignity, tyrannizes and dominates them (Luban Reference Luban and Lee2007). Moral critics reject torture regardless of how well it might or might not work.Footnote ²

My goal in this paper is not to evaluate the merits of these critiques but to evaluate how persuasive U.S. audiences consider these critiques to be. How would U.S. audiences respond to new information about the efficacy of torture compared to new information about the morality of torture? Public opinion data can provide insight into how U.S. audiences evaluate torture policy. U.S. voters indirectly shape that policy, and their views can provide a proxy for the opinions of U.S. leaders who directly shape interrogation policy.Footnote ³

To evaluate the relative strength of the pragmatic and the moral arguments, I introduce two new findings on torture that emerge from recent empirical research and that U.S. audiences are less familiar with. The first finding is that torture produces only modest intelligence. Even if torture can yield accurate information from time to time, that information is often fragmentary and unreliable. It tends to be used to confirm or disconfirm prior intelligence, not to reveal new intelligence. The second finding relates to the duration of torture. Contemporary and historical evidence suggest that torture sessions that have yielded information have lasted weeks and months, not hours and days. Torture is a protracted procedure designed to break the detainee’s physical and emotional capacity to resist. The purpose of the surveys that I document in this paper is to evaluate which of these two new pieces of information—the modest nature of the intelligence derived from torture or the cruel duration of torture—would prove more effective in reducing respondent support for torture.

Prior surveys have assessed public support for torture but have tended to focus on different forms and settings of torture rather than on different types of criticism. For example, after the release of the 2014 Senate report on CIA interrogation, national polls conducted by media networks and polling organizations showed significant support for the torture of terror suspects (CBS 2014; Goldman and Craighill Reference Goldman and Craighill2014; Gronke, Rejali and Miller Reference Gronke, Rejali and Miller2014; Ingraham Reference Ingraham2014; Lyte Reference Lyte2014; Morelli Reference Morelli2014; Pew 2014, 2015). Blauwkamp, Rowling, and Pettit (Reference Blauwkamp, Rowling and Pettit2018) argued that these survey results were sensitive to framing. References to the threat of terrorism, especially in the context of 9/11, elevated respondent support for torture whereas explicit references to torture methods in polling questions suppressed support for torture.Footnote ⁴ In a meta-analysis of thirty-two surveys conducted between 2001 and 2009, Gronke et al. (Reference Gronke, Rejali, Drenguis, Hicks, Miller and Nakayama2010) found that public support for torture varied depending on the torture method proposed. Respondents were most likely to endorse sleep deprivation and they were least likely to endorse waterboarding, sexual humiliation, or electric shock.Footnote ⁵ Mayer and Armor (Reference Mayer and Armor2012) confirmed these findings in a series of ten surveys conducted from 2004–2009, showing that respondents were most likely to approve of sleep deprivation and least likely to approve of waterboarding.Footnote ⁶

Of particular relevance to the surveys that I present here are the findings of the Program on International Political Attitudes poll (PIPA 2004; Nincic and Ramos Reference Nincic and Ramos2011) and a survey conducted by Carlsmith and Sood (Reference Carlsmith and Sood2009). This PIPA poll asked participants explicitly about their objections to torture and found slightly higher support for moral arguments (77%) than for pragmatic arguments (70%). This poll also confirmed that its respondents considered sleep deprivation to be the least objectionable form of torture. Moreover, the PIPA poll highlighted two factors that tended to enhance public support for torture. Higher numbers of respondents supported torture when told that there was a strong (as opposed to modest) chance that the detainee had crucial information. More respondents also supported torture when told that the detainee had information about a possible terror attack as opposed to information about a suspected member of a terror group. In a separate survey, Carlsmith and Sood (Reference Carlsmith and Sood2009) showed that respondents were more likely to endorse the torture of “guilty” detainees, suspected of direct involvement in terrorism, regardless of information about the efficacy of torture.Footnote ⁷ Below, I use these findings to design a survey scenario that will pose the hardest test for torture critiques: The use of sleep deprivation to torture terror suspects (as opposed to mere witnesses) said to withhold information on a pending terror attack.

Consistently across these surveys, men, Independents, and Republicans have tended to endorse torture to a greater extent than women and Democrats. For example, Lizotte (Reference Lizotte2017) found an 8% gender gap in support for the use of force, including torture. Increased threat perceptions led men but not women to be more likely to support the use of torture. Drawing on the PIPA survey, Haider-Markel and Vieux (Reference Haider-Markel and Vieux2008) showed that Republicans were more likely than Democrats to support harsh interrogation techniques and that men were more likely to support such methods than women. For example, when asked about kicking or punching a detainee, being female or Democrat decreased the likelihood of support by 6%. Miller, Gronke, and Rejali (Reference Miller, Gronke, Rejali, Lightcap and Pfiffner2014) note that the shift in U.S. public support in favor of torture around 2008 was attributable primarily to Republican voters and, to a smaller extent, to Independent voters. Mayer and Armor (Reference Mayer and Armor2012, 443) confirm that party is the strongest predictor of attitudes about torture, with Democrats most likely to oppose torture, Republicans most likely to endorse it, and Independents occupying intermediate positions.

The following analysis also seeks to contribute to the literature on attitude change and the “backfire effect” (Aramovich, Lytle, and Skitka Reference Aramovich, Lytle and Skitka2012). Several scholars have argued that providing respondents with information that contradicts their beliefs can perversely strengthen attachment to those beliefs. For example, Nyhan and Reifler (Reference Nyhan and Reifler2010) showed that respondents who believed that Iraq possessed weapons of mass destruction, and who were shown evidence debunking that claim, clung to their beliefs more than respondents who were not exposed to the “debunking” information. Another study found that behavior, rather than beliefs, backfired: Debunking myths about vaccines, for example, reduced beliefs in those myths yet decreased the intention to vaccinate among respondents (Nyhan et al. Reference Nyhan, Reifler, Richey and Freed2014). Yet other studies have found no evidence of this backfire effect, or have noted it only where respondents held extreme ideological or partisan beliefs on a subject (Wood and Porter Reference Wood and Porter2019; Nyhan et al. Reference Nyhan, Porter, Reifler and Wood2020). These analyses propose that corrective information can be somewhat effective at increasing belief accuracy, though this effect may decay over time as cues from elites and the media undermine the information (Nyhan Reference Nyhan2021). The surveys reported here test whether new information on the duration of torture and the modest information derived from torture will affect levels of support for torture.

To explore whether U.S. adults consider pragmatic critiques more or less persuasive than moral critiques, I designed and fielded a pair of on-line survey experiments using national samples. Respondents were recruited via Amazon’s Mechanical Turk and results were collected and tabulated by Qualtrics.Footnote ⁸ I administered the surveys in April 2021 to 1,031 American adults and a separate sample of 1,116 American adults.

In the first survey, I asked respondents about their support for the interrogation of a known terror suspect who refuses to share information about a terror attack. To assess the impact of pragmatic considerations, a second group read the same scenario but was also told about the modest nature of the intelligence that would be extracted from the suspect. To assess the impact of moral consideration, a third group read the initial scenario but was also informed that torture might take a month. A second survey sought to assess the impact of moral considerations using a within-subject design: I provided information about the duration of torture to all respondents in sequence and not in parallel.

First Survey

Procedure

1,031 American adults participated in this survey.Footnote ⁹ They were randomly assigned to one of four conditions, each of which varied what the respondent read about the interrogation, the duration of torture, and the resulting intelligence.

The Control condition was designed to determine respondents’ baseline support for interrogations with torture. Because my goal was to provide a hard test for the persuasiveness of different arguments against torture, I sought to create a scenario in which respondents might otherwise be expected to support torture. Consequently, this scenario downplays uncertainties surrounding interrogations with torture.

Q1: Control: Imagine that the CIA has been collecting information about a future terror attack in the U.S. They have now detained a suspect who has some information about this attack. The suspect refuses to share information about the attack. If he is denied sleep during the interrogation, he is more likely to cooperate. Would you be in favor of preventing the suspect from sleeping during the interrogation?

The Control condition invited respondents to acquiesce to torture by stating as fact what is often highly questionable during interrogations. It assumes explicitly that the suspect has information, and that this information is pertinent to a specific future terror attack. It also states as fact that torture may increase the odds of cooperation. It proposes a form of torture, sleep denial, that participants in prior surveys rated as the least deplorable.

My first survey included three separate treatment conditions that emphasized the modest nature of information derived from torture, that emphasized the prolonged duration of torture, and that emphasized both of these aspects. Respondents not in the Control condition read the same information as in the Control condition and were randomly assigned to also read one additional piece of information, which was either the Modest, the Time, or the Combined treatment.

Modest: He probably won’t reveal new information but he could help the CIA confirm their suspicions about the attack.

Time: The interrogation might last a month.

Combined: The interrogation might last a month. He probably won’t reveal new information but he could help the CIA confirm their suspicions about the attack.

After completing this first part of the survey, respondents answered three demographic questions (gender, age, political identification) as well as two questions about torture efficacy and duration. The first was a multiple-choice question about efficacy:

Q2: Do you think that torture can force uncooperative terror suspects to reveal useful information?

Possible answers were “yes,” “sometimes,” “rarely,” “never,” and “I don’t know.”

The final question in the survey was an open-ended question about torture duration. I focused this question on waterboarding, rather than sleep deprivation. Because participants in prior polls consistently ranked waterboarding as the harshest form of torture, and because participants might not consider sleep deprivation to be torture unless it was protracted, I was curious to gauge their estimate regarding the duration of this form of torture.

Q3: What do you think: How long might it take to waterboard an uncooperative terror suspect before they start to reveal useful information? (Limit your answer to five words).

Results

As expected, the idealized scenario proposed in the Control condition elicited a relatively high level of support for torture. Whereas in prior surveys, respondent support for torture ranged in the 30%-50%, this scenario provoked nearly 76% of respondents to support an interrogation accompanied by sleep deprivation. Of those who read the Control condition (n=254), only 24% (n=62) did not support torture.

Men supported torture at a higher rate (81%) than women (71%). Support for torture increased with age. Those aged 45 and above supported torture at a higher rate (79%) than those aged 30–44 (77%) and at a much higher rate than respondents aged 18–29 (68%). Support was highest among self-identified Republicans (92%), compared to Independents (84%) and Democrats (67%). Yet regardless of gender, age, or political affiliation, the majority of respondents acquiesced to interrogation combined with sleep deprivation in this scenario.

The Modest treatment yielded similar support for torture. Here, 74% of respondents supported interrogation accompanied by sleep deprivation even though the detainee “probably won’t reveal new information.” Regardless of gender, age, or political affiliation, support for torture was similar to support under the Control condition.

The Time treatment, however, had a sizeable effect on respondents. Only 60% of those who learned that “the interrogation might last a month” endorsed interrogation with sleep deprivation. Across demographics, the Time treatment indicated a lower support for torture, even for groups that showed high support for torture in prior surveys and in my Control treatment: men (62% support compared to 81% in the Control treatment), Republicans (81% support compared to 92% in the Control treatment), and Independents (47% support compared to 84% in the Control treatment).

The Combined treatment showcased lower support for torture than the Control or Modest treatments but slightly higher support than the Time treatment alone. Among respondents exposed to the Combined treatment, 64% supported torture.

When asked Q3— “How long might it take to waterboard an uncooperative terror suspect before they start to reveal useful information?”—87% of those who offered a specific timeline in response to this question (n=701) expected that waterboarding would reveal useful information in less than one week. Only 8% (57 respondents) expected that it would take more than a week and less than a month, and only 5% (33 respondents) assessed, correctly, that it would take a month or longer.

Table 1 offers an ANOVA pairwise analysis of the four treatments. Table 2 displays a linear probability model. Figure 1 shows a comparison between the four treatments along with associated 95% confidence intervals that were constructed using this linear probability model.

Table 1 ANOVA pairwise analysis of the four treatments in Survey 1

Table 2 Linear probability model for Survey 1

^***p < .01; ^**p < .05; *p < .1.

Figure 1 Support for torture across four treatments

Discussion

My first survey confirms hypotheses 2 and 4 and disconfirms hypotheses 1 and 3. Even in response to a prompt that led most respondents to sanction torture, those respondents who learned that torture might last a month endorsed torture in far smaller numbers than those who had no information about the duration of torture. However, respondents who were informed that torture would yield modest information did not endorse torture significantly less than those respondents who had no such information. Nor did these two pieces of information reinforce one another and yield much less support for torture. Respondents who were informed that torture was both lengthy and would produce modest intelligence were less supportive of torture than the control group, but they were not, by and large, less supportive of torture than those who only learned about its duration.

In most cases, adding the Modest condition to the Time condition undermined, rather than strengthened, the opposition to torture prompted by the Time condition. This suggests that the two treatments are not independent of one another but have a multiplicative effect. Perhaps combining both pieces of information, drawing on different philosophical rationales, confused the participants in this survey. Alternatively, because the Modest treatment implies that some information can be derived from torture, feeble as it may be, this suggestion may have weakened the repellant effect of the Time treatment. Rather than highlighting that torture is a weak source of intelligence, the wording of the prompt may have inadvertently emphasized that torture was at least somewhat effective.Footnote ¹⁰

A review of respondents’ answers to my open-ended question about torture duration (Q3) sheds some light on why the Time treatment was so powerful and significant. The participants in my survey expected torture to yield results in hours and days, not weeks or months. Given this false belief in the brevity of torture, it is not surprising that respondents responded vehemently when I informed them that it would last a month.

Second Survey

Procedure

To see whether disclosing information about torture duration indeed had a robust effect on reducing support for torture, I designed and fielded a second survey; 1,116 American adults participated in this second survey.Footnote ¹¹

The first question in this survey was identical to the Control condition of the first survey. All participants were asked this question:

Q1’: Imagine that the CIA has been collecting information about a future terror attack in the U.S. They have now detained a suspect who has some information about this attack. The suspect refuses to share information about the attack. If he is denied sleep during the interrogation, he is more likely to cooperate. Would you be in favor of preventing the suspect from sleeping during the interrogation?

The following questions varied based on respondent answers to Q1’. Those who answered “yes” received a question about the expected duration of torture. This question is a variation on Q3 from the prior survey, but instead of waterboarding it focuses on the form of torture mentioned in the Control treatment, sleep deprivation. This also ensured a larger sample of answers, given lower public rates of opposition to sleep deprivation as a form of torture.

Q2’: How long do you think it would take to interrogate this suspect, using sleep deprivation, before he started to reveal useful information?

Possible answers included “several days,” “several weeks,” “several months,” “never,” and “I don’t know.” Given the nature of sleep deprivation, I did not include “seconds” or “hours” as possible answers.

Subsequently, those who offered a positive answer to Q1’ and now answered Q2’ then received this question:

Q3’: You now learn that the interrogation might last for a month before the suspect cooperates. Would you be in favor of preventing the suspect from sleeping during the interrogation if it lasted one month?

This is a variation on the Time treatment from the first survey except that the treatment is now explicit: Survey participants are openly asked to reflect on the effect of prolonged torture duration on their deliberations.

I asked respondents who rejected torture in the initial scenario (Q1’):

Q4’: Which of the following pieces of information is most likely to change your mind, so that you WOULD be in favor of interrogating the terror suspect using sleep deprivation?

Possible answers included: “You find out that the suspect has precise information about the timing and location of the future attack,” “you find out that the suspect is himself a terrorist,” “you find out that the attack will happen very soon,” “you find out that the attack will kill many people,” and “none of these answers.” These possible answers were displayed in random order.

I asked respondents who continued to endorse torture even after they were told about its lengthy duration (Q3’) the inverse question:

Q5’: Which of the following pieces of information is most likely to change your mind, so that you would be AGAINST interrogating the terror suspect using sleep deprivation?

Possible answers were the inverse of the answers to Q4’: “You find out that the suspect has only vague information about the timing and location of the future attack,” “you find out that the suspect is not a terrorist,” “you find out that the attack will not happen anytime soon,” “you find out that the attack will kill few people,” “None of these answers.” These answers were displayed in random order.

I wanted to find out why respondents, who initially favored torture, no longer favored torture when they learned about its duration. In particular, I wanted to explore whether the “ticking bomb” logic determined their stance. Was prolonged torture too slow to effectively defuse an imminent threat or was slow torture too cruel?

Q6’: Why are you against interrogating this suspect, with sleep deprivation, for a month? Select the best reason.

Possible answers included: “A month is too long to deprive someone of sleep,” “If it takes a month, it can’t prevent an attack that is happening soon,” “by the time he shares the information, it’ll be out of date,” and “none of these answers.” These answers were displayed in random order.

This second survey concluded with three demographic questions (gender, age, political identification).

Results

Participant responses to Q1’ correspond to the results of the Control treatment (Q1) in the first survey: As before, 76% of respondents endorsed torture in this scenario and 24% did not.

Hypothesis 2

In the first survey, the information about time was part of a survey experiment. Respondents who learned about the month-long duration of torture were unaware that other respondents, in parallel, were not told about torture duration. In this second survey, I was transparent in presenting information about torture duration as a novel input. Only respondents who had been willing to endorse torture in response to Q1’ were told about the lengthy duration of torture. The phrasing of the question (“You now learn …”) certainly primed the respondents to reconsider their prior endorsement of torture.

Nonetheless, the results are remarkable. A full 39% of participants who had initially supported sleep deprivation now changed their minds and no longer favored sleep deprivation (refer to figure 2).

Figure 2 Change in support for interrogations with lengthy sleep deprivation

Note: Confidence intervals at 95%. The column on the left depicts the proportion of respondents who endorsed torture in Q1’ (n=1116). The column on the right depicts the proportion of respondents who endorsed torture once informed that torture might last for a month (Q3’). This comparison assumes that all of those who opposed torture after Q1’ continued to oppose torture after Q3’.

Adding these novel torture opponents to the initial torture opponents suggests that new information about the month-long duration of torture shifted the camp supporting torture to the minority across all demographics (with the exception of respondents who self-identify as Republicans). If, in response to Q1’, 76% of respondents endorsed torture, now, in response to Q3’, 30% changed sides, leaving only 46% of all respondents in support of torture. It is worth reiterating that this is a wholesale refusal to support torture in a scenario designed to evoke acquiescence of torture: certainty about the identity of the detainee, their possession of intelligence pertaining to a future terror attack, and the use of sleep deprivation as the chosen form of torture.

Hypothesis 4

The responses to Q2’, regarding expectations about torture duration, also map onto the responses I received to the duration question (Q3) in the prior survey. 783 respondents, all of whom had not favored torture in Q1’, selected a precise timeline in response to this question. As before, the overwhelming majority expected torture to yield results within days and few respondents expected the interrogation to last weeks or months. Table 3 compares the answers of Q3 in the first survey to Q2’ in this survey.

Table 3 Expectations of torture duration before a suspect starts to reveal useful information

As could be expected, there was a relationship between expectations about torture duration and refusal to endorse lengthy torture. Those who assumed in Q2’ that torture should last days were particularly taken aback by the disclosure in Q3’ that torture might last one month. Of those who initially endorsed torture and expected that torture to last weeks or months, 21% now opposed torture. Of those who thought that torture should last days, 46% now opposed torture.

Q4’ asked respondents what it would take to sway them in favor of torture. Many respondents (40%) checked “none of these answers,” implying that nothing would change their minds. Another 29% suggested that finding out “that the suspect has precise information about the timing and location of the future attack” might change their opinion, echoing the weak effects of the Modest condition in the first survey. Only 8% chose “you find out that the attack will happen very soon” as a reason to support torture.

Q5’ asked respondents the opposite question: What would it take to change their opinion and oppose torture? Forty-nine percent of respondents who had sanctioned torture in Q3’ chose “You find out that the suspect is not a terrorist.” Another 22% claimed that they would turn against torture if they found out that “the suspect has only vague information.” Only 6% chose “you find out that the attack will not happen anytime soon.” Another 16% checked the “none of these answers” option.

Q6’ asked those who changed their mind when they learned of its duration, and no longer favored torture, why they changed their mind; 332 respondents answered this question. Only 34% selected one of the two pragmatic answers: Torture is ineffective in preventing looming attacks (21%), and information would be outdated (14%). The majority (61%) selected the moral answer: “A month is too long to deprive someone of sleep.”

Discussion

The disclosure that torture might last a month led the majority of participants in this second survey not to endorse torture, even though most had initially sanctioned torture in this specific scenario. Q4’ and Q5’ were designed to understand why learning about the duration of torture changed (or did not change) their endorsement of torture. Their responses to these questions should be treated with caution given their appearance at the end of a survey containing multiple loaded questions.

Given the salience of the ticking bomb metaphor, I expected that information about the proximity of an attack and the urgency of successful interrogation would be a primary factor in determining opinions about torture. Though I did not manipulate proximity and urgency in this survey, the answers to Q5’ suggest that respondents were less interested in urgency. Most respondents (61%) claimed to object to prolonged torture because it was cruel, not because it was ineffective in defusing ticking bombs.