Honestly what planet are you living on.
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.
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.