I know plenty about the Nazis, and of course I detest them.
Stop with your self-righteous lectures. I don't deny that Papon should have known, or may have known, that the poor people MIGHT be killed. That's not the same as a mass murderer who deserves to go to hell. Nor, for that matter, do I deny that he shouldn't have collaborated with the Nazis in any way. Of course he shouldn't have. But again, we have to distinguish the various degrees of culpability and degrees of evil. Apparently, this is what Papon's jury did. It is part of our Western heritage, and of freedom.
He should still have died in prison. (I wonder why de Gaulle thought he'd be useful to him - that's the other side of the story to Google another day...)