Well, yes it was, because it was engineered. The Nazis never won a majority in any election, but once they were in power they were famous for their social engineering and propaganda. They're a classic example of how a minority of people in a population can absolutely gain control over everyone else and bend the majority to their will using highly cynical but intelligent tactics.

That's a personal interpretation. In fact, in many ways it doesn't discount it but actually inspires them, asserting that without such efforts society is likely to backslide into fascism fairly easily. Which tbh, if you've lived in the US from 2001 to 2005, or today in Russia or Hungary, you've basically experienced already.

That does not mean that society carries all responsibility for the actions of this or that person, of course, that's never the case. What the banality of evil tells us is that society contains the conceptual germs for behaviour that can turn atrocious, when brought to extreme lengths by this or that individual.