It's so stupid to think of Hitler as some anomaly of evil. It's even stupid to think that of the Nazis as a whole. It was just a freak wave of "Evil" that requires no further explanation and that we're magically incapable of.
It was a response to their environment. Studying the conditions that led to the Nazis is probably going to be more informative than how you'd shoot Hitler and magically avoid the entire problem.
But, hey, that's how all stupid Democrats think about Trump, as some spellcaster who's hypnotized all his voters, which is a colossally miss of why people actually support him and a display of pathetic levels of charity and theory of mind about other people. "Don't you know he's a criminal and a liar?!?!" It's like an NPC talking at you whose programming can't countenance concepts like "protest vote", "humor", or "fear campaigns designed to control you".
Wilson's absence at the league of nations led to the punitive Treaty of Versailles.
As for Trump he does the Gish Gallop, spewing lies so fast you can't argue with him in good faith. He doesn't believe in democracy, and should have never been let near power, ever.
Then I would make sure Bill and Hillary never met.
It would be such a better timeline... I think.