The Nazis who ran the death camps used a lot, and I mean a lot of Vodka.
SS troops who functioned as death squads often struggled for years, with the guilt of what they had done. I expect many of them committed suicide because of it.
“I expect many of them committed suicide because of it.”
Thus ensuring them a place in Hell twice over. Lucifer must have been tickled pink that he could not just convince them to do evil, but also do the final act of ultimate self destruction to themselves.