for putting undesirables on state farms / precluding them from procreating.

If it werent for the fact that the government and woke activists would surely abuse this, you have to agree that some people should not be allowed to procreate. There was a case a few years ago where a women addicted to sniffing gasoline was pregnant with her 7th child. Everyone of her other children had been born mentally defective because of her gas sniffing. The children's aid society attempted to place her in a sort of protective custody until she gave birth so they could prevent her from saddling society with yet another brain damaged child who will be a drain on the system forever. Her legal aid lawyer successfully challenged the detention and the court ruled that the government could not protect this child because it was not born yet. So the mother was entitled to damage the fetus as much as she wanted and let the rest of us deal with the mess she made. Who knows how many more kids she had after she left the limelight.

Cases like this make you want to prevent monster parents from having more kids.

But of course this would devolve into an abusive mandate where parents who don't embrace the government's agenda are not allowed to have children. Or some races will not be allowed to procreate in order to promote some diversity race quota.

So in other words, in extreme cases I think this would be morally justifiable but impossible to put in practice without creating more harm than good.