Small anecdote about this from my own family. In the 1940s, my paternal grandmother was ordered to host a young man who had been a warden in one of the German Concentration Camps. That man had nightmares every night and when my grandmother mentioned this to a neighbor along the lines of "If Hitler weren't such a stuck up about the Jews, we wouldn't be in this pickle" she got rounded up by the Gestapo and questioned for a day, and only let go because my grandfather was at the Eastern Front and known to be a good citizen (i.e., fervent Nazi).

This is _the only story_ about the Nazi time I know about my grandparents. Everything else was stoic silence.

Everyone knew.