This is wrong. Yes, the Nazis built systems specifically designed to break up social cohesion with Jews, e.g. first deporting them from smaller cities to Ghetto

This is wrong. Yes, the Nazis built systems specifically designed to break up social cohesion with Jews, e.g. first deporting them from smaller cities to Ghettos, then deporting from Ghettos to KZs (concentration camps). And also yes, relatively few actually knew about the scale of operation themselves, but a large part of the population knew that many of those deported were killed and not just deported to work camps or whatever. It was not a well-kept secret. Also, NS propaganda was full of the "[Endlösung der] Judenfrage", eradication of Jews etc., though it did very intentionally leave execution open. I think it is fairly obvious that most didn't want to know anything about it, choosing to ignore what is happening.