Hitler has a difficult childhood.
A lot of people have bad childhoods without becoming genocidal dictators... he's not going to get any sympathy from me on that score.

Hitler is also a Jew.
Unproven and now disbelieved by many historians.
did you know when hitlers mother was pregneat with him she seriously considered abortion
Ditto.
In the real world, Franz Ferdinand's sons (Duke Max and Prince Ernst) were vocally anti-Hitler and were interred in a concentration camp because of it. So I'm sure Alek would likewise clash with Hitler... of course it would be incredibly epic, because hey, it's Alek...
...but who's to say that the unique circumstances that led to Hitler taking power would even arise in the Leviathan world? If the war's shorter (and it might be) then the economic impacts on Germany would be less devastating. If Alek holds his empire together... if Germany is more emphatically defeated... if Hitler is KIA in 1914... if, if, if. It's fun to speculate about, but I don't think we should take WWII as a given here.