Also this.
Dh and I are similar, exacerbated by different parenting styles. In our case, and I suspect many others, I've found it easier (but not easy) to accept that dd needs a different type of parenting, an understanding that her more destructive behaviours are a result of her difference and struggling to cope than wilful naughtiness. He had a very strict upbringing, so he cannot let things go and choose his battles. When he's told to fuck off dickhead by dd, he's furious and wants consequences, which invariably make things much, much worse. Parenting a nd child is often counterintuitive to the things you're told in parenting manuals. We've discussed divorce, multiple times, but I've always been clear that if that ever happens, he'll still be doing 50% of the parenting. And then I worry that he "won't do it right" with dd and end up causing more damage. I wonder how many of these single women feel the same. Mothers generally do tend to have more patience, understanding, ability to change etc.
Add into the mix that when you have a nd child, you're more likely to have at least one parent who is also nd, it makes for really challenging family dynamics. Often nd parents (especially those who are impulsive as a result of undiagnosed adhd) struggle to coparent effectively. There is a huge lack of support for parents and families trying to navigate pathways, access appropriate counselling (which more often than not costs money) and essentially deal with a really shit situation.
Divorce in our case feels like the wrong decision, for pretty much all of us. Dh and I love each other, we generally support one another (despite our different parenting styles). But boy, it's really hard sometimes and I can understand why parenting a disabled child splits up so many couples.