I think the real reason so many people don't have children — despite their somewhat socially acceptable stated reasons — is simply that they don't want children.

That's a hard problem to solve.

If you force people to be parents, that feels like it would not lead to a great outcome for the children.

It's not a problem. It's basic autonomy. My life is my own, and I am not state property.

And, frankly, what makes you think I'd be willing to raise somebody else's children if I don't want to have children of my own?

The very notion of mandatory parenthood is as un-American as the notion of an official church of the United States. What in Satan's holy name is wrong with you?