Eugenics is like a strange attractor for scientists: over and over again, smart quantitative people who learn about genetics, selective breeding, and human phenotypes all end up converging on the idea of using selective breeding humans to "improve the phenotype" in their biased and preconceived notion of what "improve" and "phenotype" mean. It's not at all surprising that Galton (one of my personal heros for his statistical work; I made a Galton board) and Fisher (not one of my favorites) both explored these ideas alongside their scientific efforts.