Japan was the worst and everybody who had even a clue fucking despised them. Their war crimes are the ones most associated with actual large swathes of US citizens and allies despite being under taught. They were the only country to take American civilians, innocent normal people, and brutalize them. Their war crimes, while not at industrial scale, were still massive and, perhaps the most scary, utterly spontaneous. Their ideology of a warrior culture was fucking fragile as fuck and you never knew if a glorious last stand would protect your people when the Japs eventually won, earning their respect, or would lead to starvation, mass murder, cannibalism, rape, ect. Hint hint, it was mostly the latter.
Fuck the japs, we should have nuked them several more times just to make a point. The Cold War and the fetishistic otherness of the """Eastern Cultures""" ruined our chance for good old fashioned multi generational blood feud.