Mental health is socially defined to a very large extent. One of the ways that we evaluate a person's mental health is whether their issues interfere with an ability to live a "normal" life, which includes providing for themselves. Well, a person's ability to provide for themselves can vary drastically based on external circumstances, like how rich they are or what social services they have access to.

It's my belief that it's rare for evolution to screw up. Of course, sometimes it does, but I'd argue that many mental illnesses are the result of one's mind being equipped for a different set of circumstances than the one they're in. In some cases, there's clear evidence that this is the case, but in other cases it's more difficult to prove.

I just don't believe we should give up on a person just because they ask us to. If a friend came up to me and asked me to help them kill themselves because of a mental illness, I would do everything I could to find an alternative solution and talk them down from it. I feel like that's the normal response anyone would have, and people are treating it differently just because a state said that it's ok.