On a purely genetic level, race mixing is actually TERRIBLE. It is literally undoing thousands of years of evolution for no reason whatsoever.

Take the example of a black and Asian couple (One of the lesser common ones, but it showcases the situation the best) and let them have a child.

What does that child get? Let’s speak in terms as if we got an average Asian woman and an average black dude (Average IQ, strength, etc. for their respective race). We lose 2 (TWO!!) standard deviations of IQ right off the bat since a persons IQ always gravitates to their race’s average. Athleticism is a lot harder to study but I’m pretty sure that the child will lose out of his full potential in that area due to Asian genetics.

Now do this for every single inheritable trait… you get the picture.

But hey! At least they’ll have a better immune system!