I strongly recommend reading this. It’s mainly from Laurence Rees’ brand-new book named “The Holocaust: A New History”, which is sublimely written by a master scholar.
To many, the SS seemingly consisted of leaders of men. In fact, a lot of the members merely followed the herd of people who seemed to know what they were doing. It’s easy to spot now, but why should they have been questioned? Pretentiously enough, I say that criticising one’s own actions is obligatory.