***The Holocaust was intended to eliminate moral inhibitions,***
You would be surprised how quick you can adjust to such killing.
While working in a chicken hatchery I noticed all the cull chicks were killed, either by breaking their necks if just a few, or by drowning them if several hundred.
Several years later, a new method shocked me. A furnace in which you pushed whole boxes of chicks into the flame. But after a few weeks, you got used to it.
In reading a book “La Question” by Henri Alleg, about the French problems with the Algerian rebels, he tells of a young man new in the service being shocked as to how Algerian suspects were treated.
A few weeks later he saw the same man, his face distorted with anger brutalizing the suspects.