If childcare resources were abundant and free that would offset the problem a great deal, but capitalism and rugged individualism and all that. Like, given all the stupid out there I definitely see the appeal of it, and even things like eliminating genetic disorders would qualify so the line gets kinda fuzzy insofar as the ethics are concerned. The issue is that once systems are in place for wide scale eugenics of any flavor, some asshole will absolutely use it to genocide an ethnic group or other minority.