Attachment theory suggests that our moral underpinning comes from doing what is best for the child. And the morality of attachment theory is challenging at all

Attachment theory suggests that our moral underpinning comes from doing what is best for the child. And the morality of attachment theory is challenging at all stages of life. Having the child is necessary but insufficient to do good. Letting the child relish in uncontrolled impulses is good now and bad later. And so on. In light of that any assertion of having children being defacto good or not is incomplete without describing the overall society. Evolution is a strawman in this sense; our children do not immediately enter some Darwinian gladiatorial arena of genetic destiny. They are going to sample from the best examples they can find of how to live, and friends, extended families, and ideas echoed through time(as communicated orally, in books and other mediums) all play a part of that. It's not all on the parent, and if it's not all on the parent, then childless adults have a place, an "ought to do something for the child", even if they are not writing King Lear or inventing calculus.