According to those “rules of engagement,” it was morally right to shoot an unarmed Vietnamese who was running, but wrong to shoot one who was standing or walking; it was wrong to shoot an enemy prisoner at close range, but right for a sniper at long range to kill an enemy soldier who was no more able than a prisoner to defend himself; it was wrong for infantrymen to destroy a village with white-phosphorus grenades, but right for a fighter pilot to drop napalm on it. Ethics seemed to be a matter of distance and technology. You could never go wrong if you killed people at long range with
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