The parent isn’t doing eugenics. They’re maximizing the potential of the kid they already have.
If you’re calling for a mass in breeding program on humans beings then I have nothing further to say.
The parent did a partner selection before the breeding took place, unless there was rape involved; and I doubt a parent that wants a kid that turns out right goes to: "hmm today I will breed with the disabled person to make for great offspring", no they will select for a mate that they think is good and this choice is implicitly eugenic: they will not declare to be august masters of eugenics but they will look for a good partner to provide healthy offspring.
Yes and that choice is ideally made freely and without coercion. Not following the diktat of some geek bearing equations. It’s very arrogant to assume that some central planning can replace the distributed computation of millions of people making free choices. Free markets everywhere except here ?