I can travel back in time? I'm giving all the goddamn smoke to the whole future Nazi regime. Hitler, Mengele, Goebbels, Himmler, Kramer, and all the rest of those monsters. On my way back, I'm taking out Stalin too. And Chairman Mao.
You think I'm going to let a bunch of time travel fiction scare me off? Naw. This whole "but someone just as bad will replace him!" sounds like some divine destiny bullshit and that doesn't gel with me.
Besides, if I return to the future and it's fucked up, I'll just go back in time and kill myself. EZ.
Just kill the German industrialists who thought they could control the far right to defeat the socialists. I still think the only way to avoid what happened would be either avoiding WW1 or inflicting an actual heavy defeat instead of the armistice.