The gas chamber was small. And it was half hidden underground. It was supposed to be a shower. I thought it would be much larger, but how much room do you need to squeeze people in and turn on the poison? If the room was too big you need more gas to fill it and the people would take longer to die. But they weren't people, were they? At this point the German soldier had to think of them as varmints, animals who did not belong on this earth.
He had to de-personify them. Didn't he?
Because he couldn't actually watch all those men and women and little kids walk in there, naked, and know he was going to exterminate them, and still believe they were fellow human beings, could he?
He wasn't responsible. He was just doing his job, wasn't he?
And afterwards,
did he scrub his hands carefully?