Do you have any evidence of this? As someone from a Muslim country, my family universally has stayed in bad marriages. My wife, an American, has a family rife with divorce. (Not just her parents, but the whole community. Many people don’t really realize this—among those with college degrees, almost 80% of marriages will last 20+ years. But among those with just a high school diploma, it’s just 40%. In lower middle class communities, kids with parents who are divorced are the norm.)
It’s not clear to me which one is better for the parents. But unhappy parents seems superior to divorced ones for the kids. The financial and structural disruption on kids from divorce is massive. It’s not just individual, it’s the whole community. In the lower middle class communities where my wife’s family is from, divorce is the norm. And I can see kids suffering from the disruption, and wanting stability, but having no role models and no guidance because most people around them are divorced.
This is obviously anecdotal. I’d be curious to see data—to my knowledge this hasn’t been studied rigorously. To me, the notion that “divorce is a fine outcome for marriage” is something that is counter intuitive enough to require some evidence.