Earlier quoted context omitted.
> and then gaslights them into believing it's their fault for not coping with it. I don't understand why you say that. Are you saying therapy make people feel guilty of their own self?
No, society does that. Our society is, apparently, perfect, and if you have trouble living in it, it's your fault - says society. However, how we often approach mental healthcare - as something individualistic and separate from society - is one of the things that normalises it.
Why ?
It depends, coping with the imperfection of society is also something to work on. Accepting its flaws lets you walk around it. Sometimes it's not the individual who is the problem, but it doesn't mean he should not accept how the society is flawed.
Mental healthcare and therapy have an individualistic approach because that's what they do, how else? To change society you would need politics, and that's another matter entirely.
I often say that mental illness doesn't really exist, because as long as we don't understand the brain there is no "normal" behavior. But as the same time you can't deny that society has its norms.