I think in many ways forums like this can be helpful to those struggling, as almost by definition, you don't know most of the contributors in real life. So if you can get over the hurdle of actually bringing it up, it's possibly more useful discussing it with relative strangers than with good friends or family. They may already know and be unable to help, or already know and are already helping, or may not have a clue there's a problem at all, but may not react helpfully if they did know. Losing friends can be enough of a fear to not risk it, and so venting off on a 'common interest' site like this could be very helpful for some. Clearly the audience isn't hostile, and those who can't help or who aren't interested don't have to participate, and those who are can. And it's free, unlike a shrink.
One of my ex-on-off girlfriends had terrible problems with depression, long before I met her, and not as much after, thankfully, but it was always extremely difficult for me to fathom what the problem was, as whenever she described it, none of it sounded that bad (to me). Eventually I met her dad, and part of it at least was then explained, as he was a bit of a nut-job, and was (psychologically) bullying her in private (they all worked on a family business). He didn't really like me - not because I was hostile, but as I was clearly smart and 'together', and was easily capable of seeing through his bullshit and conveying that to her, which I did.
We didn't become a real item as we lived hundreds of miles apart, and I couldn't have coped with the stress of her losing it regularly anyway - going out with someone to try and keep them sane isn't sufficient justification, all things considered. But she never sorted it out, and eventually committed suicide, which was a ridiculous waste of a life and a large talent. And I'm sure it ruined the rest of her parents' lives too, but hey-ho, they had their chance. Even now, nearly twenty years later, apart from her dad being a twat, I can't see what the real problem was, other than total 'ennui'.
I've never really had any issues with my parents though, and grew up poor, working-class and Catholic, so maybe that's it? Getting 'IRA' chalked on your school blazer back in Jubilee year by the local proddy schoolkids can be character-building. They didn't have no web forums then - I had to go fishing