Honestly what planet are you living on.
Catholics have significantly lower divorce rates: https://www.catholicnewsagency.com/news/28161/catholics-cont...
From my priest friends, I've heard horror stories of couples they've managed to convince not to marry. We are talking couples who could not agree on kids, or who had major family issues or resentment, or couldn't agree on finances.
It's best for everyone if these just don't marry.
There are awesome marriage schools, called couples counseling, and a lot of people do just that before getting married to help expose some of the gotchas that you don't realize before getting married (lots more farts basically). Should it be "policy?" Hell no, but it would probably help new families a lot for people to do it.
Is marriage required or just a two parent household ?
I largely agree, but the idea of promoting two parent households isn't antithetical to your statement. You could have programs that are meant to ensure that couples get married for the right reasons, with the right skills, etc. It's likely a marriage prep/ed course would result in fewer divorces, just as drivers ed results in better drivers.
Ine example, if your primary discussion about what happens if the marriage doesn't work out happens after the fact, then you were ill prepared. Better to have that discussion while on good terms going into it - like a collaborative prenup consultation at least.