Kind, good, happy, gentlemanly, secure people never go Nazi. They may be the gentle philosopher whose name is in the Blue Book, or Bill from City College to whom democracy gave a chance to design airplanes—you’ll never make Nazis out of them. But the frustrated and humiliated intellectual, the rich and scared speculator, the spoiled son, the labor tyrant, the fellow who has achieved success by smelling out the wind of success—they would all go Nazi in a crisis.

https://harpers.org/archive/1941/08/who-goes-nazi/