No, he’s asking why there are so many people who seem to have a need to prove that blacks are naturally dumb.
The answer to that is obvious.
Thing is, you can give an IQ test to white Americans, you can give an IQ test to Ethiopian villagers, and the white Americans will do better than the Ethiopians. Now, what does that mean?
Even if we could prove that IQ score is 100% heritable it wouldn’t prove that Ethiopians are naturally dumb, because heritability doesn’t work that way.
Simple analogy. Suppose I were to discover that height in corn plants is 100% heritable. When I analyze the varation in corn plants, I find that all variation can be accounted for by genetic factors.
So if I have one corn field with 6 foot average stalks, and another field with 3 foot average stalks, and the variation is 100% heritable, does that mean that the 3 foot corn plants are naturally short? No, because the six foot corn stalks got fertillizer and the 3 foot stalks didn’t. Different corn fields, different results, and still we have 100% heritability of height.
It’s abundantly clear that kids in Ethiopia get less school, are less exposed to the concept of standardized testing, undergo periodic famines, their lives are disrupted by war, they are more exposed to chronic diseases, and so on and so on and so on. And so it is perfectly possible for kids in Ethiopia to do much worse on IQ tests than white Americans while having no genetic differences than white Americans, even if IQ were 100% heritable. Heritability - Wikipedia
So the question is, why are we worrying that maybe blacks are just naturally dumb, when perhaps we should first worry that black kids are in crappy schools, crappy environments, exposed to crappy diseases, and so on. Even if it were true that blacks are naturally dumber than whites, what public policy follows from that? They should get less school, less health care, and so on? Or should they get more? And since we know that bad schools, bad health, bad environment and so on will make kids score worse on IQ tests, how about we fix those things first, then we can worry about genetic variation.
It seems to me that there really is variation in intelligence, and it seems like smart parents frequently have smart kids, and dumb parents frequently have dumb kids. We know that there are genetic problems that cause mental defects, so in that sense we can say that there are certain genes that make you dumb. But there haven’t been identified any genes that make you smart. Maybe being smart is just a result of having very very few of the genetic defects that make you dumb. And of course, it’s certainly not unknown for genius parents to have a developmentally disabled child, and for that disability to be caused by a single genetic defect.
On the other hand, humans are smarter than chimps, and chimps raised by humans don’t become as smart as humans, and since chimps and humans are genetically different it seems trivially true to assert that humans are smarter than chimps due to genetic reasons.