The KKK national headquarters was in Indiana during the 20s, and Indiana was the state with the largest membership. I wonder if there is a connection. In any case, the trouble with eugenics was that it was not scientific at all. Its conclusions derived from very sloppy methods of collecting “evidence” to bolster its bigoted claims. It has nothing to do with the modern science of genetics. “War against the Weak” is an excellent book on the subject.