There's a DC alternate history where the Nazis win WW2, but it turns out that it's because Lex Luthor went back in time and froze Adolf Hitler in a big block of ice.
There are two things about this that immediately strike me from a story telling point of view. First, Hitler was a moronic egomaniac, whereas Luther is a genius egomaniac. Second, I don't think Luther would actually do the Holocaust, his bigotry is directed towards Meta Humans and Space Aliens, not Jews and Romani.
I am not actually familiar with where the writing for that arc went because I have neither read nor watched it, I'm simply aware of it, but if it has a good writer... Though I don't imagine that they actually tackle that idea because it would create big ethical questions around returning the timeline to the one we know.
Coming at this from a Watsonian perspective, living in a world where Luther had stopped the Holocaust, if the Justice League put it back the way it was then they would be the bad guys.
I should maybe watch it, but I expect to be disappointed and think I could have done better.