Yes, on point 3: According to 'Auschwitz, the Nazis & the final solution', as the orders came from Hitler those working at the camp thought they were doing the right thing as they trusted their leader.
https://uktvplay.co.uk/shows/auschwitz-the-nazis-and-the-final-solution/watch-online
@zleap @Strandjunker https://rationalwiki.org/wiki/Argument_from_authority