I can ensure you that couple staying in unhealthy marriage is more detrimental to mental health of their children than them being raised by divorced parents.

Often times people don’t want to ask themselves a question why their adult children can never find healthy partners and never find healthy relationship (not talking about occasional or one time bad dating experience, everyone has that). The answer often is because their kids never saw healthy relationship growing up. They get to see their parents being miserable so that’s all they know. And trust me, kids always know

So of course it’s hard to divorce when you have children but every time people choose to stick around they should think what kind of damage they inflict on their kids and how it effects their capacity for having good relationships and their mental health in a long run