Some interesting points raised here. I do tend to mostly agree with you Derfel, and there are other points which I also tend to agree with made by others.
Yes, life is such a miracle, such a totally unimaginably large, evolving, waxing and waning amoeba like state of a substance! Life is wonderful !! I wouldn't, as some of you would know, say that we (as animals, as all animals and plants even too !! you know...) posses life, but rather that we are life.
Life is the the active force driving reproduction, which is, for the very most part, life--this spiting of cellular functions, cells themselves, growth, and so on. Without this active force, life is not. . . but that does not mean the individual. (the individual is a participant in life, the active force, not a possessor of it)
For that reason, I feel it is important to weigh each and every case of suidicide. There will be found times where it is actually a person's brain that tricks itself into going into suicide mode, without any 'willful' act by the person themselves...(this has to be looked at very carefully, since we are, by all means, simply and only, our brains and genetics)
I have know two people in America who had killed themselves. As far as I can see, based on what I know of them and their circumstances, their lives up to that point, I would say that bad choices along the way, lead to a situation wherein they took a wrong turn, a turn which led to a dead-end. After having reached that dead-end, their mental states were not capible of turning around. Disconnection was the only choice they could muster up. It was sad.
I have had a relative almost do so, too. That was the brain doing it in that case...little choice involved, for the basic part. The one person here in Japan that I knew of who comitted suicide was about my age, the father of a child who was in my eldest son's class from elementary school up. It was hush-hush (which I think is really bad...bring it out in the open, be honest about it, and that may help) so I don't really know, but it seems he chose that to save his family financial burden...maybe like Goldiegirl's grandmother-in-law.
We must keep in mind, however, that at times, in the mind of the suicide-state-of-minded, there is already no longer the 'I'--or,as the word for the self is in Greek, ego.