During the recent Fallujah fighting a US Marine found himself on the horns of an ethical dilemma. He and his squad came upon a group of enemy soldiers who were lying as if dead or wounded in a religious shrine that they had previously been using as a defensive fighting position. This enemy force, consisting of ununiformed guerilla fighters who had booby-trapped the bodies of their fallen comrades, had also faked death to shoot at Marines. The soldier saw them, made a probabilistic decision that at least one of the enemy was really laying an ambush, and pumped rounds into...