> People would have children for emotional reasons even if society does not intervene.
Yes, but the success of those children is still a societal concern. You want some of those children to be a new generation of doctors, teachers, etc. etc... without supporting them at a young age (i.e. providing education, a welfare safety net) there's no guarantee that would ever happen, and they might end up being more of a drain on society than a productive member.
I agree that it is reasonable for a society to support parents with child-raising to a degree (by say offering free public education and healtcare). But it is a fundamental responsibility of parents, society is here in supporting role.
Yes, but the success of those children is still a societal concern. You want some of those children to be a new generation of doctors, teachers, etc. etc... without supporting them at a young age (i.e. providing education, a welfare safety net) there's no guarantee that would ever happen, and they might end up being more of a drain on society than a productive member.