Not just WW2, but even reaching back to the German Empire/Weimar Republic with surveillance of homosexuals [0] and other collections of private citizen data, which to this day is considered a prime example of "You can't guarantee the next government won't abuse that data".

The GDR with it's Stasi also didn't really make a great case for "Trust your government, give them all your data!"

That's why a lot of Germans are very careful about private information, we've seen it abused at large scale, with inhumane results, not just once but twice.

[0] https://de.wikipedia.org/wiki/Rosa_Liste