Why should America restrain itself in detaining, interrogating, and targeting terrorists when they show it no similar forbearance? Is it fair to expect one side to fight by more stringent rules than the other, placing itself at disadvantage? Is the disadvantaged side then permitted to use the tactics and strategies of its opponent? If so, then America's most controversial counterterrorism practices are justified as commensurate responses to indiscriminate terror. Yet different ethical standards prove entirely fitting, the author finds, in a conflict between a network of suicidal terrorists...