That cartoon doesn't recognise the fact that any supposed disadvantages that the lower-IQ ethnic group has have been accounted for in plenty of studies. The
Minnesota Transracial Adoption Study gave white and black children the exact same conditions in their upbringing and still found the white children to have IQ's that were high enough to be statistically significant. The nature of that study meant that any educational or cultural factors were made redundant.
What I see in everyday life tells me that there are not huge differences in the mental capabilities of white and black people. But when you are talking about races that have lived in isolation from each other for thousands of years and begin from a very limited gene pool, then the way in which they develop certain racial characteristics over the generations is simply an extension of the same principle where children tend to take on their parents features. That's why Mongoloids have epicanthic folds, Northern Europeans have fair hair, Africans don't have crowns on the tops of their heads, native Americans can't grow facial hair, Ashkenazi Jews are particularly prone to certain genetic defects etc. These are not evolutionary traits that were selected for in some sort of Darwinian survival of the fittest enviroment. They are just hereditary traits passed down from parent to child, but magnified over many generations, as is the way of things. I don't think it is therefore outrageous to suggest that mental differences will complement these physical ones, in fact common sense says that is is impossible for them not to not exist at all (no matter how insignificantly).
Although at the same time using white and black as the categories to base the study of intelligence and everything else on is not ideal. 'Race' isn't something clear cut, different races aren't billiard balls (to use the political comparison with nation states) that never interact. Different races or peoples or whatever you want to call them have never been completely isolated, and thats why for example even though Somalians have black skin, they tend to have more Semitic facial features.
But just because race isn't something as simple as being black or white doesn't mean that it can be dismissed entirely, I think that is just wishful thinking and ignoring common sense and reality.
And although I don't think that racial differences are anywhere near significant enough to trump what all of humanity has in common, I've got to say I find the prospect of a world where everyone has brown skin, brown eyes and black hair to be pretty terrifying.
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