[danieltillett]

Races are biologically meaningless, but species are a real things. Lions and tigers are different species of the genus Panthera, they can mate and have fertile offspring.

I think where people get worked up is thinking because there are different species of humans living on the planet that one must be better (or worse) than the other. Nobody with a clue would say that lions are better cats than tigers, just different. The different humans species are the same.

The other thing that makes things more complex is all living humans are predominantly sub-Saharan African (90% to 100%). If you had a large cat population that was 95% lion and 5% tiger you would most likely not even notice it was not a pride of lions. It would still be a different species, and the average member of this population would be different to the average lion, but the differences would be relatively subtle.