I like your post above, @Gerontius, but disagree that divorce is to be avoided at all costs. I think when a relationship becomes abusive and starts to corrode one person or both, that people need to act in the interests of their mental/emotional health and life goals. I think that domestic abuse terminates the wedding vows, well before divorce does. Also, if a person has married a predator or even just a narcissist - and people, especially young people, may not realise this until they are already married - then they ought not be pressured to stay with such a person, on account of having married them. Some of these people are really good at putting on a show for a while, until they have their target where they want them.
If a marriage doesn't bring out the best in both people, and allow both people to have peace of mind and to develop themselves positively as human beings, then it's not a healthy marriage. Sometimes counselling can help couples, but only if both are motivated, and they have a decent counsellor, but both of those aren't givens.
I'm a fan of marriage personally and I take it seriously, but there are conditions under which I would discontinue a marriage - and that is if it stopped being healthy, and started seriously damaging one or the other person and their humanity, wellbeing and purpose in life.
This is definitely the "Rest of the Story," as Paul Harvey would have said on the radio.
I always like being optimistic about stuff. Even bad stuff. Down inside I like to think most people could do just fine by actually changing.
But I think it's neat that you brought up the other aspect of the vows--The moment you start seeing people who are abusing one another, it's very likely they were never properly married in the first place. I'd think it's pretty tough to call it a marriage when people go through the motions of getting married without opening themselves up to that actual generosity inside, where they'd never even think of hurting their spouse.
"Marry in haste, repent at leisure" might be good advice for a lot of folks rushing into marriage...how can it be a union of two hearts if people involved don't even know their own heart.