If overpopulation is such a terrible thing, then we have to have a good solution to solve it. Never do evil that good may come of it. The Dalai Lama presented something that would be very good if it organically grew in society, i.e., people voluntarily taking up the celibate life. The Dalai lama snickered, but I bet you dollars to donuts that if you researched it, that is his view. This has always been my solution to maintaining stability in population growth. It makes sense, and it is beneficial to society. Tibet at one time, I think, had 25% of its mature population in vowed celibate life. I think that was the figure. Either way, it was a very large number. Obviously this would allow people who want to be married and have children to have as many as they like, so the question of birth control becomes a non-issue. This is if overpopulation was even a problem. Social security isn't funded because millions of future workers were aborted and contracepted out of existence. Those are signs of dying civilizations. The birth pangs we fill now in the world are the scrambles for the resources that we can import into our atrophying societies.
As for the question of birth control in itself, I think most of these people are not concerned about the plight on the world, but their own selfish wants. How many people practice contraception for any other reason than avoiding pregnancy? It is a behavior that doesn't want to deal with the full consequences of an act, which in my mind is highly unskillful. I think this denial of the reality of sex, and its primary purpose which is reproduction of ourselves, is part and parcel also of a hedonistic society. A race to the bottom.