I remember the Jensen controversy at the time.  I could not understand why it was so incendiary.  Jensen and later studies showed there was a hierarchy.   Ashkenazy Jews at the top., then Mongoloid, then Caucasians, and then African descent people.  The Bell curve for these groups had a whole lot of overlap, so what does it matter.  There are many Africans that do score higher than certain individuals from A. Jews.   Oh, a whole lot of Africans would be at the lower end? - ----How important is that?   If you fit people into the jobs they are able to do and you pay 'burger cooks' a fair (living) wage, and judge all work as noble what is the problem?