It seems more than coincidental that global fascism started to rise as soon as the generation that last defeated it had mostly died off.
It's much simpler to think that as a society we've manufactured a similar set of circumstances to the last time. That is, a growing proportion of the population that feel they have very little and no prospects or hope.
https://en.m.wikipedia.org/wiki/Strauss%E2%80%93Howe_generat...
Definitely controversial academically, but the idea of a generational cycle has been considered.