Up to a point, and see my reply to retchdog about circumstances. However, there are people living with chronic pain and disability who don't choose suicide. There has to be a trigger somewhere that makes some people suicidal in those circumstances and others not.
And yes, not everyone's pain is physical, but pain is pain - if we understood the workings of the mind better, we might be able to help those in any kind of pain.
Where it gets more complicated for me is that I do actually support assisted dying, with appropriate safeguards. So I suppose I see that it can be rational in some circumstances - for the terminally ill, for example, or those diagnosed with alzheimers. I'm equally aware that seems to contradict my view that suicide is a symptom of a potentially treatable mental illness.
It's a difficult and nuanced subject. Ideal for discussion on Slashdot, where open minded discussion is to be expected! No, I'm really not new here ;)
That wasn't a dig at your response, btw, in case it wasn't obvious.