People with extreme views appear to have fixed positions, but actually reflect calculations unlikely to be swayed by wartime information. The Evaluative Public, whose valuations are not in the tails, use wartime information to form their conflict approval. Evaluators are sensitive to changes in beliefs about observed casualty levels and expectations of likely future casualties. The Evaluative Public represents those who change positions in war, from support to opposition, depending on their ETC and RP. Using historical data and innovative experiments, we demonstrate that people’s personal experience with war drives their estimates of total casualties. Holding goals constant, higher costs yield higher opposition while lower costs increase support. Holding costs constant and allowing goals to change leads to opinion change. Geographically and temporally proximate casualties strongly influence estimates of a war’s total costs. Thus, we see that casualty patterns affect people’s estimates of a war’s costs and that these costs, when contextualized with the value of a conflict and expected costs, shape wartime support, even in the face of strong individual-level characteristics.