I was reading an autobiographical account of an Army Air Corps POW. He was on a train that made a stop at Dachau to unhook several box cars containing Jews. Although he and his fellow POWs feared for their lives, they were reassured by their guards that the Germans would not treat them the way they were treating the Jews.
What rationale did the Nazis give for the differences in the way they treated Jews v. POWs? A naive perspective might argue that those actively opposing the Nazi regime should receive the harsher treatment. Was it merely that POWs explicitly fell under the Geneva Convention, or was there something more?