[WeepingWillow]

He said they broadly reviewed behavioral genetics research and did not mention GCA in this sentence, probably on purpose?

I don't think there is any proof that eugenic policies will fail to work for GCA or even other behavioral traits that are highly heritable. See, e.g., https://infotomb.com/0q783.pdf

[danieltillett]

Eugenics is just another name for selective breeding and it is hard to come up with a proof that selective breeding works for all other species, but not humans.