It's called Eugenics, a pseudo science that had great popularity in England and America largely in the early 20th century. In Mein Kampf, Hitler wrote of his admiration of American Eugenic proponents. Do a little research you'll see names like, Rockefeller (Standard Oil), Margaret Sanger (founded Planned Parenthood to enact her eugenic philosophy), Leland Stanford (railroads and Stanford University). In the Nuremberg trials following WW-II Nazi defendants cited the forced sterilization of mental patients and minorities as justification for their crimes. I'm not seeking to make a political point, and know I've gone off topic. I just wanted to point out this pseudo science is in no way foreign to the US but has its roots here and still has some influence.