If you want to have a system which determines which people will or won't make terrible families, only permitting the former to reproduce, you want a system of social control. If children were delivered randomly by storks it would be something else. Aviation regulations? Avian regulations? Something like that I guess.

Not all social control is bad. Society and its institutions often limit what people can do. But of late we've mostly determined that restricting reproduction should be used sparingly, not defaultly, and I tend to agree.