"Two things are infinite: the Universe and human stupidity. But, for the Universe, I don't yet have absolute certainty" (Albert Einstein).and probably not much, or even no more, prone to war crimes than we were. My father survived the battle of Guadalcanal because of Japanese "chivalry" and at another time witnessed a cook murder a seated captured Japanese airman that he and other aircrew were talking to and having a meal with. The cook was not prosecuted.