William James used to say that temperaments determine philosophies. People who respond to international affairs divide temperamentally into two schools: those who see policies as wise or foolish, and those who see them as good or evil. One cannot presume an ultimate metaphysical antagonism here. No person can escape perceptions of good and evil—even Machiavelli counseled the Prince not to forget, when circumstances impelled him to do a bad thing, that he was doing a bad thing—and no policy can wholly divorce political from moral principles. Nor in the impenetrability of human motives can we easily know when the moral reasons are political reasons in disguise (very often the case) or when political reasons are moral reasons in disguise (more frequent than one might think).