It's actually not that unusual. My family vacationed in Scotland once for a few weeks and we ran across a handful of black people.Hristo Tzonkov said:I'm more interested in how Demoman is a black Scott.
Valve intended the Demoman to be white at first, but they thought he had too much of a "Groundskeeper Willy" vibe. Solution: make him black.
Anyway, I don't think the Medic is or was a Nazi. The vast majority of Germans during World War II were not Nazis, and the Medic would have been too young anyway. It's conceivable he might have been drafted into the Hitler Youth during the closing stages of the war, but even if he was I don't think he would have believed in the Nazi creed. After all, he saves the lives of Russians and blacks on a regular basis.