There's one problem with that: America is the exception among developed countries, not the rule.
In terms of social mores, most developed countries are totally different from America. And more developed. Here in the US, we're still battling it out with our Puritanical roots and there are lots of ways in which we are socially undeveloped.
Most other developed countries are in fact MORE socially liberal than we are. Guess what? Those countries have lower divorce rates than we do, and lower abortion rates than we do. They also have lower STD rates, less crime, better education, and a higher standard of living.
These things have all been somewhat stunted by the current state of the economy, but it's the same for the US - the comparison still stands.
You know what's really interesting about some of these countries? The most liberal amongst them - Sweden, for example - have lower marriage rates. However, they have high cohabitation rates. People are settling into life-long relationships, but they just aren't getting the piece of paper that goes with it (in part because they live in societies where unmarried people are treated better legally than they are here, so there's less need). So comparing marriage rates 1-to-1 is an inaccurate way to look at it anyway.
In these countries education in general, and sex-ed specifically, is also better. Therefore, use of birth control is more consistent and more correct, and accidental pregnancy is less common.
If you want to talk about high abortion rates in developed countries, America is actually leading the way. Reality is exactly the reverse of what you're saying.
We haven't broken these cultures. They have, wisely, decided to completely ignore our social mores and focus on their own. Our social mores are incredibly backwards to them.
And we're the ones with the higher abortion rate.
This is way simplified of the great variety that exists in Europe. Most are struggling from old age to pay pensions and make their youth feel comfortable enough to have children. They are relying on immigrants for labor, and their growth is stagnant. They have almost no babies, and that would make one expect that they are better brought up. They lack extreme left to some extent, and so women are given counseling before they get an abortion, no one lies to them and tells them there isn't a human being there, they are told a list of things that can happen due to abortion, they are offered further counseling services and advised to seek counseling if they have problems following an abortion. Some governments require full counseling and a waiting period before getting an abortion. In this country abortion operates almost outside the law, because it's legal bounds were not written with medicine in mind, but by the SCOTUS.
If you want to talk in terms of birth control, then we have governments that use birth control consumption rates to help budget for breast cancer treatment, because they clearly recognize the birth control causes breast cancer, as does the UN. In contrast, in the US, 40% of doctors don't inform women that birth control causes breast cancer, and in many cases I have run into pro-choicers who assert that it does not cause cancer, which is almost as ridiculous as denying that there are side effects of abortion.
We did not break Russia, its dying from the same disease.
Many of the countries there are trying to figure out how get people to have and raise children. There are ghost town... also, there are ghost towns in Japan, despite the often heard assertion of crowding... We have not really exported our pro-life culture until recently, so many of the countries only accepted poison, and have little resistance... which is ironic considering the initial settling of the Americas... now that I think about it... Of course, much of this stuff was developed in Russia and Germany along with propaganda used to propel it.
Of course, the post you are responding to was in an even wider context, discussing the failures of the West, and how we can't reasonably assert that they will solve the problems of the developing world. China says look how well we're doing. And thanks to breaking international laws, slave labor, and forced abortion, they are having some success. But, it is unclear how the country is going to avoid collapse in the near future due to the low number of young people, the already existing high rate of unrest, and the related extreme rate of executions and imprisonment (sometimes slavery).
If you look at the world, objectively, we see that we are in the depth of darkness propagated primarily by Bolsheviks and communists, seized hold of by radical feminists who are intent on destroying the very foundations of Western society, such as Church, women being sacred, life, and fertility.
When we survive this we will have a very dark period of time where we are ruled over by the radical feminists pushing a culture of death over the world.
Would we give other cherished creatures, such as endangered species, birth control? Does it not objectively poison and harm humanity in the same way?