If you can't you can't.
If you don't want to, it's your choice .
But it's not always as straightforward as asking for help. Especially not with how underfunded mental health is in this country and the complex issues some people might have. There are plenty of posts in the mental health board where people have tried everything and still left in a bad way. You can feel their desperation.
I'll give you some more examples.
A being raped and then dealing with the aftermath. Took her a while to come forward and approach the authorities . Took 2 years to even go to court and in the meantime she was told any form of therapy would muddy the waters. She did get help after, diagnosed complex PTSD and two more years on she's finally on the other side of the deep hell she was in. But it took 5 years of moans,rants, deep depression,panic attacks etc that her friends supported her through. For 3 of those years she had nothing else.
B struggles deeply with anxiety and depression. She also has a deep mistrust of MH HCP because when she did ask for help as a teen(admitting she was abused as a father) they told her mother,sided with her and she ended up institutionalised. Not to mention the forced medication episode with the psychotic side effects which meant she jumped out of a window believing she can fly. That kind of fear,mistrust and vulnerability are not easy to overcome no matter how many people tell her to go see a GP. She has a few friends she trusts with it all and that's it.
C has a history of self harm, being laughed at,disbelieved,mocked,being called stupid. She has a background that drummed into her that mental health issues are either for the "mental asylum people" or bored housewives. She developed other coping mechanisms and is mainly ok but can get incredibly insecure and low. There's no way in hell she'd lay it all out in front of someone official. Most people think she's one of the happiest people ever.
However , if people are dicks that has nothing to do with their mental health. All the people I mentioned aren't dicks or just take take take so I'm happy to be their friend and support them,even if sometimes it's a bit much. They would and have done the same for me,even if less often as I'm mostly ok . And we still laugh and joke and enjoy some things together, but it takes effort on both our parts.