Let’s put divorce aside. If someone comes from a more “violent culture”, thus resulting in more domestic violence than other communities, that in itself indicates less happier marriages. So domestic violence rates would be a good indicator even if you’re dismissive of divorce rates.
It would not at all, joe. Because suppose two communities have the same marriage happiness rate (60% very happy, 20% moderately happy, 10% neutral, and 10% horrible), you might find in one community there is no domestic violence and in the other there is 10% domestic violence. But it shows nothing about the happiness of their marriage.