McGrath of Harlow said "I'd guess that if Hitler had died in infancy, there'd have been some other Hitler figure. It seems to me that the madness didn't have its source in the one man, but in the people around and below him. They'd have found someone else, I'm sure.

I tend to agree that the scene was set for "one strong man" but the "not hitler" would have been different.
What if he embraced communism, or extreme capitalism, rather than "National Socialism".
What if he was obsessed with religion rather than race?

Things might have been very different