You can't really generalize - there are a lot of great humanists too,

I can generalize about a white supremacist society. The dominant thread is white supremacy. If you cannot call out prevailing tendencies, you will be unable to understand why, say, Germany embraces and materially supports yet another genocide.

The funny thing about Euro humanism is that it is usually entirely theoretical. They think nice things, allegedly. But where is the action? Usually absent, but when present it is almost always misdirected. And when it's not? Well, they are then oppressed by the state and their oppression accepted by their fellow masses.

And the vaccine against Nazism that everyone seemed to believe Germany received at some point certainly did not work.

It simply never existed, though East Germany did better. Liberalism was "restored" in the political sphere but the material basis for explicit fascism was simply directly resolved by looping West Germany into subimperialism. The Nazis killed or otherwise exiled their scapegoats, never to return. The remaining people retained their tolerance or embrace of that ideology, living in the country they had wished to before, just without the ugly military uniforms and appropriated "Aryan" symbols. And, most importantly, they continued their role as an anticommunist force, the same impetus for the original material support for Naziism both domestically and internationally.

A lot of people are still flirting with authoritarianism, never mind loudly supporting an ongoing genocide funded largely by their own taxpayer money.

"Authoritarian" is a word promulgated selectively for the purposes of imperialism and white supremacy, just like "government" vs. "regime". The relevant tendencies are liberals, fascists, and so on. And a large group of people with no real political consciousness swayed instead by all else that exists around them: degrading material conditions, false promises of liberalism, and the tolerance and promotion of fascistic thinking and oppression of left thinking. AfD continues while Marxist reading groups are oppressed.

But then again, Germans are also in the streets protesting against it, getting their shit beaten out of them by the cops.

Not very many, but yes some are. A very small minority of Germans reject white supremacy and take action.