The sociopathic leaders of large organizations will do what is expedient, and the rank and file will do what they are told, or willfully ignore what is happening.
It takes an invading force to come in and establish that something was evil and clearly the work of madmen. My guess is that the nazis had perfectly normal brains, much like our own.
This exercise mostly just shows how foolish Rorschach tests are. I saw 2 dwarves high-fiving.