Many episodes, or aspects of episodes, in American foreign policy quickly get pigeon-holed as successes or failures. The label gets stuck to the episode, as a frozen judgment from an earlier time, and then the episode gets repeatedly referred to in such terms. The Western intervention in Libya two years ago customarily gets labeled this way as a success. The basic facts underlying that judgment are that the intervention helped to topple a dictator who was widely loathed, and did so with minimal direct cost to a war-weary American public. In the ensuing two years, a difficult and unpleasant reality in Libya has displaced many of the hopes and assumptions that prevailed when Muammar Qadhafi was ousted and killed. That is, it has displaced them on the ground in Libya, but not necessarily in the American consciousness. Early dramatic chapters in a foreign policy story generally have more effect on the judgments prevailing in American minds than do less dramatic chapters that are s...