The shitty part to all of this is that we clearly need a better meta documentation of Hitler life, let alone the Interwar and Pre-war periods. (I personally refer to 1917-1921 as the Great Communist Revolt, seriously, take a look at how many revolutions, riots, strikes, race riots, and conflicts take place and see how each of them are treated distinctly from one another with no relation; despite all of them being openly Leftist)

Historians themselves fall into the Boomer Truth regime, which actively protects Socialism from criticism, despite the fact that Hitler is & was a revolutionary Socialist for almost his whole life. When you dig into specifics the meta-narrative falls apart, but you have to do it on each topic.

It's like asking someone to prove that there's Left-wing political influence in video games, but you can only do it by reviewing and playing each game to denote each instance of political slant each time, and Leftist domination of game jams, academia, developer conferences, gaming media, and corporate politics are all instantly dismissed.