I don't believe it. I think people turned out OK in spite of schooling.
Take at hazard one hundred children of several educated generations and one hundred uneducated children of the people and compare them in anything you please; in strength, in agility, in mind, in the ability to acquire knowledge, even in moralityand in all respects you are startled by the vast superiority on the side of the children of the uneducated. Leo Tolstoy, "Education and Children" (1862)
Well yes... and so what? It’s not comparing the lot of educated CHILDREN, but children OF THE EDUCATED. Education does not pass to heirs via DNA. Surprised? (And also as long as the education is not MIS-education, their societies will be better and the children WILL benefit from that.)