Well the whole covid crisis has shown that IQ as a measure of overall emotional, intellectual, and spiritual intelligence doesn't work at all. Most of the supposedly "smartest" minds support what is going on.

You also failed to address my thought experiment. If all other 'races' suddenly disappeared, what would happen to the whites? There will also be huge differences in IQ for example. Identities would simply fracture on different superficial features, like brown versus blond hair, or the hundreds of ethnicities that also happen to have white skin.

The mistake people like you keep making over and over again is that you think this is some sort of 'survival of the fittest' game. What happens when the earth becomes inhabitable? What happens to the game then?

You have the potential to be more than an animal. You can develop self-awareness and consciousness. Then you can transcend your instinct to survive at all costs and look at the bigger picture.