Well it didn't exactly have to be him, you know. Had he caught a stray bullet in that early and unsuccesful putsch of his, or had that one been actually succesful (in which case he wouldn't have sat in jail honing his ideas), things might have turned out very different. Historical inevitabilities are few and far between, and I don't think WW2 was one - but the aftermath of the Great War certainly was a recipe for some degree of trouble.

But that contrafactual speculation.

I've read Adolf was into all kinds of weird occultism and odd causes before his ascension to power - the Thule Society and all that, although he apparently never was an actual member - and almost certainly had the usual spate of ultranationalist frontsoldat ideas, so go figure. Chances are he was fairly loony even before he started ingesting his own Party dogmas.