If race is real, then that means humans aren't immune to evolutionary divergences and might even be subject to eugenical consequences.

As you can imagine, this would be devastating to the idea that sleeping with niggers and arabs is acceptable as their violent thuggish nature would be passed on to the children and can't just be Tabula Rasa'd out by "love and acceptance."

This is harmful to both women and the PoCs, so every single group has vested interest in making sure you never ever let such thoughts happen.