Agree that statistics like these don't tell the whole story (that it doesn't take account of those who leave this group by way of marriage; that there will be a larger section amongst the non-marrieds of already-predisposed to separate, so it's not comparing like with like,).
But I want to take issue with the implication. Is the implication that getting married helps people to "stay together for the sake of the children"?
I agree that there may well be structures around marriage that keep couples together.
But is that good?
Having read a lot of the relationship threads, I wonder. There are women there who are v. unhappy, but feel socially and economically compelled to stay in less than ideal situations.
Mn becomes the (possibly only) place they can talk about weighing their happiness (which culturally we are taught to discount, or at least regard as less important than other factors,) against the social, economic, and emotional cost of separation.
It could be argued that those in marriage are already more prone to living by cultural and social norms than those who don't marry. And there are probably economic factors in there too. All of which suggest married women experience pressure to stay in marriage.
But again, is that a good thing?
Remember, every measure "supporting" marriage is, necessarily, a measure that makes it harder to leave. And, again, necessarily, makes it harder (relationally) to be a single parent. Most single parents are women. So measures to "Support marriage" are, by their nature, pretty anti-women.
Imo.