Ok, normally for a post with this sort of subject matter, I move on to the next post because all I want to say is MYOB. Reason being most of those posts scream Poor Me Waaah My Family Sucks!
However, in yours I hear genuine concern for the third parties, not attention seeking (plus I really like your answers).
So I'll answer it in a back-door way.
7 years ago I left my psycho drunken seriously ill husband. Just took my three kids and left.
I was very limited in the ways I could help him get better since in his mind *I* was the cause of his craziness.
In hindsight, I'm ashamed I kept my kids in such a miserable house as long as I did.
The logistics of the thing is a blur. I am not a strong person. I LIKED being married. I cherished my traditional family life. I am uncomfortable doing things, ANYthing for myself.
So as I look back on it, I remember a gf supporting me in a small way. I remember my sisters helping the best they can. I remember neighbors rooting for me. And a number of them actually STEPPING UP and being a little pushy.
Without all these nudges, big and small, my kids and I might STILL be living in misery, the outcome of their teen years may have been very different. Since I left, we are thriving. Even HE is better this way.
So if you, too, can find a way to nudge, maybe your nudge paired with other nudges will collectively make a difference.
Personally, with your warm heart and your stable mind, I think you can help.
:)