People's humanity and civil rights are not topics that should be open for debate. But the people who want to debate that start with "science" as the thin end of the wedge.

Of course, the thing that's always up for question is the participation of minorities. It's never a guy saying, "Fellas, the science shows that men are poor at cooperating and highly prone to aggression and violence, so let's debate whether we men should be allowed to manage or supervise other people."

It's highly motivated reasoning.