Because it’s been debunked throughout a number of the references I list, and offers no arguments beyond what is already covered in this article. This article rests on the scientific reasons IQ is invalid. If there is something in The Bell Curve that you think hasn’t been addressed by this article then make your argument. Saying “how could someone not mention…” isn’t an argument. Lazy comments that attempt to appeal to some false authority are done to deflect the real issue, and only waste people’s time.