[Raellus]

Yeah, but look at how reluctant everyone in Europe was to stand up to Hitler until '39. Why? No one wanted another world war. Appeasement was the product of war weariness resulting from the human, material, and financial costs of the "Great War". It traumatized the hell out of Europe and no one wanted to rock the boat for two decades after it ended. Imagine how traumatized people/nations would be by the Twilight War/WWIII.

Yes, there are individual citizens and small groups of radicals who just won't give a toss about that sort of thing. They might take matters into their own hands and you may see some vigilantism (or terrorism) related to wreaking vengeance on war criminals. But I really don't think you'd see governments pursuing war crimes prosecutions with much fervor.