That's why I said in the op that "extreme circumstances" should be dealt with elsewhere. If it's just little things where people want to vent then it's fine. If it's serious life crisis type stuff then obviously this isn't the best place to go.
And by "mental health", it doesn't just mean something like depression or anger management or anything like that, it can also be things like anxiety/nerves and other things. Stuff like that for example people might feel easier talking about by hiding behind a screen name.