What would allow eugenics to stay mainstream until present day and maybe even further? I know a lot of that was discredited in most people's eyes after WW2, when people found out about the horrific projects the Nazis had undertaken to weed out the unfit. Not scientifically discredited, though it may very well be invalid, but what drove most people away was the excesses it was driven to during Nazi Germany. So given this detail, what could preserve the eugenics movement to nowadays?