Which prominent conservatives?
And don't confuse republicans such as war imperialist, racist, and progressive land grabber Teddy Roosevelt with conservatives.
You would not be asking these questions if you had truly read any information on eugenics. It was a shameul period in our country supported by both Demcrats and Republucans.
Eugenics was even sanctioned by the Supreme Court with one dissenting vote by the lone Catholic judge.
I suggest your read, "War Against the Weak" by Edwin Black.