This might sound like a f*cked up question, I'm not asking if what they did was morally good or bad, because we all know it's bad
But on a justice point of view, did they break a lot of rules? I'm thinking the law of Geneva and the hague , but any other international laws of that time aswell
I have no clue what kind of rules their were, and I wanted to see if they broke a lot of rules. If they did, also prewar? Because couldn't outside forces prevent all of it?
While more can always be said, you can find a long discussion from multiple users of the question of how the regime was dealt with from the perspective of international law here, as well as discussion of the specific legalities of the Holocaust byu/kieslowskifan here and u/commiespaceinvader here (see also their answer here on the rule of law under Nazism).