Once the baby is conceived, the woman has all the legal and social power. (The man is still bigger, probably, and can kill her.) Men who don't want to spend two decades paying off a woman they didn't even like very much have got to act in their own self-interest and not screw her, even if she's easy.
That is extremely unhealthy for families and needs to change.
Men who don't want to spend two decades paying off a woman they didn't even like very much
That also need to change: the cost of raising a child should be borne by the person raising the child unless a parent refuses to raise their child. In other words, fathers - married or not - should have every legal opportunity to have custody and raise their own children, instead of being forced to pay the mother to.
Regarding the final comment, if there is no procreation, the human race dies out, so faulting men for procreating is counterproductive.