It’s still empathy–the empathy of one northern European for another.
No, but evolution of race was really popular in the 1930s with all kinds of negative examples (not just in Germany), and the bedrock of Darwinism is “survival of the fittest.” Hitler painted the Jews (et. al.) as a threat to the nation, as well as people like homosexuals and the mentally ill, and justified their extermination using his slant of the theory.
Besides which, science offers no moral compulsions whatsoever.