Most people change their minds on things like that until they've experienced it themselves, but before that, if you've had no education in psychology and how severe depression and anxieties work, you can only form outside opinions on how you think it should go.
Not saying that those people who have never and will never come to the point of thinking suicidal thought can't have an opinion, I respect that.
But as said before, it's a mental illness, not an attribute chosen. Nobody chooses depression, maybe except if you wanna fit in, but that's called being an emo, and most of them don't mean it.