I am currently reading Yuval Noah Harari's Homo Deus: A Brief History of Tomorrow. IMHO it is unfortunately much weaker than its impressive predecessor (as can of course happen with "second" books). At one point the author claims this:
[Hitler] wasn't a successful businessman or a union activist, he didn't have friends or relatives in high places, or any money to speak of. At first, he didn't even have German citizenship. He was a penniless immigrant.
When Hitler appealed to the German voters and asked for their trust, he could muster only one argument in his favor: his experiences in the trenches had taught him what you can never learn at university, at general headquarters or at a government ministry. People followed him, and voted for him because they identified with him, and because they too believed that the world is a jungle, and that what doesn't kill us only makes us stronger.
Is there any evidence that Hitler came to power because voters were impressed by his war record or by the lessons that he drew from having served in the war? At another point the author points out Hitler's undistinguished military service record over four years, which makes this conjecture even odder.
Hitler wasn't a senior officer -- in four years of war, he rose no higher than the rank of corporal.
Yes, 1932 voters may have identified with him, but did Hitler's "experiences in the trenches" of WW I really play a significant role in his ascent except in the broad sense of sharing a generation's fate?