It piqued my curiosity and I decided to do a bit of research about Franz Stangl, man who helped run the T-4 euthanasia program and later went on to head the Treblinka death camp.
About the people killed in the Holocaust, he is quoted as saying:
To tell the truth, one did become used to it...they were cargo. I think it started the day I first saw the Totenlager [extermination area] in Treblinka. I remember Wirth standing there, next to the pits full of black-blue corpses. It had nothing to do with humanity — it could not have. It was a mass — a mass of rotting flesh. Wirth said 'What shall we do with this garbage?' I think unconsciously that started me thinking of them as cargo....I rarely saw them as individuals. It was always a huge mass. I sometimes stood on the wall and saw them in the "tube" — they were naked, packed together, running, being driven with whips...
Justifying his actions he said:
What I had to do while I continued my efforts to get out was to limit my own actions to what I — in my own conscience — could answer for. At police training school they taught us that the definition of a crime must meet four requirements: there has to be a subject, an object, an action and intent. If any of these four elements is missing, then we are not dealing with a punishable offense....I could apply this to my own situation — if the subject was the government, the "object" the Jews, and the action the gassing, I could tell myself that for me, the fourth element, "intent", (I called it free will) was missing.
That reminds me of pro-aborts who say that abortion can't be murder, murder is illegal!