It is scary to think in this mindset because the thought that springs to mind is withholding health and nutrition. People will starve and die like they used to in the good old days of stable populations. Maybe population growth will be reversed in Africa, and those societies will become able to provide a decent standard of living. Things will be good after the bodies finish rotting in the streets, dead from lack of food and medicine. Witness China's population policies and the forced sterilizations in Per .
Widespread contraception is clearly bad from a practical point of view.
It is an old society, where the young are the minority and innovation and creativity suffer. A contracepting society is one that despises its ultimate resource people. Misanthropes will probably reject being called this. I love people, so I don't think a child should grow up in a slum. But misanthropes are bent to see every child as a burden, every man as a liability and every pregnant woman as a danger.