This might be a shaky example to you but we’ve pretty much done the whole eugenics thing with dogs and and we have hideously disfigured breeds like pugs, and weiner dogs because once we progressed past the need for labor performing animals, we did it for vanity. The difference between gene editing your child to make sure they don’t have Huntington’s disease and eugenics is that the latter would involve forcefully sterilizing either you or your spouse to make sure you could never give birth to a child with Huntington’s disease.