Kate Paulk writes at Sarah’s place on “the ease of evil” and makes a familiar point:
The various Communist regimes can be dismissed as “not counting” because to the minds of those who do the dismissing, Russia, China, North Korea, and Eastern Europe “weren’t civilized”, and so Communism/Socialism would work just fine implemented by civilized people (they usually point to one of the Nordic nations when they do this). These same people are a big part of why the wrong lesson keeps being drawn from Nazi Germany.
The problem was not nationalism. It was not even the disgusting racial laws. Those laws could never have been passed, much less enforced, without the one big thing Socialism, Communism, and yes, Nazism have in common.
The supremacy of the state.