> It was not inherent nastiness that led to the Holocaust, Bregman suggests, but years of indoctrination.

Arendt's entire report on "The banality of evil" was essentially a direct refutation of that exact argument. Nazi evil was 'banal' in a way, to use Arendt's term, precisely because it was, unambiguously, evil. There was not even the start of a colorable argument that it could be for any sort of "greater" good, no matter how construed. And the whole indoctrination part was as banal and as evil as the rest of it. Complacency towards authority demands and the diffusion of responsibility were the key mechanisms, not indoctrination per se.