I'd have more sympathy for them if their plan at the time wasnt to genocide 90% of eastern europe.

That was never the plan. This isn't even any "yay, Hitler good" thing either. It's just clearly not what the plan was. Hitler, at least in his claims, wanted to save Europe. Ironically, he wanted stability. And he was willing to work with Russia, and others. Things got very messy, entangling alliances dictated all kinds of weird stuff, politics and power jockeying went on, and so much more, but they certainly didn't want to kill Europe, Eastern or otherwise.

Everyone was a monster in WW2. Everyone did fucked up things, everyone did war crimes. The war should have never happened. But, no, I don't think Hitler and the Germans wanted to kill 90% of Eastern Europeans. And we largely only hear one version and side of the story, that tries to paint the losers as the absolute worst people ever. And some of them even were, to be clear. Some of the Nazis were not just as bad, but actually worse than what we're told. Absolute demons. But, as a group, the stories about the losers of WW2 are often greatly exaggerated.