(These) studies are not entirely uncontroversial as they're often considering only specific population groups or only a few individuals per countries.

I'm not so much into the racial aspect of hereditary intelligence, but as said before, it's inevitable. For the most part then it's true that people from Singapore have a greater predisposition to higher intelligence and people from New Guinea have a lower one. Everyone else is in between these two extremes.

I accept that real equality is not natural or genuinely even possible. That I am smarter than some people and some people are smarter than me. I'm not offended by this. It's a beautiful revelation for a world view, that different approaches can be created around how various people perceive reality and require different methods of learning.

Instead we think everyones the same and will have the same outcomes. That we can solve everything wrong with people of all backgrounds by forcing and repeating the mantra of education/environment as if it's some social snake oil. That theory is clearly not working.