There are those that believe that And for some it may be true.I believe that those who have made the effort to legally make a public committment in marriage will put more effort into keeping that marriage.
I think the narative in many of the religious communities is if you are committed until death or burn in hell, that people will put forth their best effort and find a way to make it work.
For some, that has probably worked out like that.
But for others it has likely created a tortured dungeon and created a living hell here on earth.