I agree.
Thank you for your clarification.
I was playing the devils advocate by creating an extreme scenario (a bad one too

) where someone can't deal with a very long term issue that they cant accept, and was wondering if there's anything that can be done to help them, apparently, or at least what I could understand, is that
we can only listen to them and hope their "immune" system kicks in eventually before they destroy themselves.
That's exactly it.
I've been working as a counselor for a while, and so a lot of people come to me and just complain about everything. They hate their jobs, hate their partners, hate their kids, and hate their lives. All I can really do is sit there and read their texts, because it's online, and try to empathize with them. All they really want at first is for someone to listen... It's a lot like coming home to a wife or a girlfriend who just complains about everything, but doesn't want you to do anything to help her she just to listen to her. So that's what I do.
You have to just make an effort to care and listen to them tell their stories. Maybe ask some follow up question, because it going to be your job to try to process that information so you can calm them down. Then when they're done you ask them if they would like some help, and they usually do. All you do there is give them the advice they want.... and that's tricky. You can't tell anyone to do anything they don't want to do if it's painful.
It's like how week after week I have the same couple of women just miserable with their cheating and/or abusive husbands who ask me what they can do to make things better. I get one email from one every couple of weeks, and another from a woman while she's at work. Now I can't tell them "Just leave him!" because they won't listen. Or they will listen for a while and then go back to living in limbo. There's not a lot I can do there. It's their choice after all. So all I do there is just listen to them when they're having a bad time, then I try to get them to think about things in several different ways. From their perspective, from their partner's perspective, and from an outsider's perspective. I'm very good at getting them to that "Aha!" moment.
It's not just women too. I do get a few emails from guys, but guys don't really ask for help that much. And I'll get the same emails from the same people all the time. What amazes me is that there is a natural cycle here and I won't hear from certain people for months at a time. Everything will be fine and then suddenly they'll have complications with their separation or the ex husband will do something really shitty to try to hurt the jilted ex wife. So what I do is just try to calm them down and repeat what they've told me and try to include some stuff that they can't see right now.
For instance about a week ago a friend of mine, a beautiful redheaded nurse and mother to two daughters, contacted me very upset that her husband admitted to drinking again and having yet another affair. So I asked her what happened in between Christmas and now and just tried to point out that this was his decision. Her husband didn't even try to make a new year's resolution, he held up the act for 3 weeks, went back to sneaking out and drinking, and then had his 51st fling since the week of their wedding. They haven't even been married a decade and he's just a dawg.