Off topic unfortunately, but related to the link Thomas cited, the very lucid and fascinating Sister Y wrote in response to a question as to why philosophers treat the default position as against suicide;
"I don't know why this should be. I haven't come up with any explanations for this that I find compelling. Perhaps it's the psychological salience of the act of suicide, or the ubiquity and ancientness of the prohibition, although philosophy is usually able to get behind such things."
One theory for this may be that society recognizes retrospectively in the person who has committed (or attempted) the act, an individual who was of relative greater worth to the maintenance of the society. Thus the victim of a conventional act of violence is still commiserated, of course, but in a very different way. A hypothetical explanation for this would be that it is because the individuals who attempt to remove themselves from existence are more likely by their actions during life (Sublimations in the CATHR sense, I think) to provide Distractions (in the CATHR sense) to needful members of society, (almost everyone else). (As another aside their greater intensity of feeling may also correspond to a spirit of self-sacrifice useful to the society, but this is another issue).
Another way of phrasing it is: the group in which suicidal propensities occur strongly overlaps the group with an ability to provide a society/culture with meaning. Their suffering is a terrible by product/consequence of the ability to be so close to meaning and to communicate it (or its lack). They see the palette or toolbox for what it is – others see the created picture. If this were recognized probably unconsciously by society it may explain part of the "ancientness of the prohibition". These same individuals may be more likely to posses a creativity vital to others -
I am thinking along the lines of this
http://en.wikipedia.org/wiki/Creativity_and_bipolar_disorder
and Kay Jamison’s "Touched with Fire" book - I am not sure the correlation between bipolar and creativity is proven concretely by science (Honestly though, I declare non-objectivity - I will probably believe it exists, faithfully, forever) but the bipolar suicide connection is quite clear I think and has also been my anecdotal experience. Please note: I am not inferring that creativity requires this, just that the state which has been termed "bipolar" has a correlation within it, with creativity. I am also not arguing there is an identity betwween pessimists and individuals with the bipolar state, just some overlap - I am also not arguing many other things and probably I am incapable of sharing my thoughts sufficiently clearly, for which I apologise.
I have probably communicated these ideas poorly and none of the connections I hypothesize, even if correct, are going to be absolute, just some thoughts, still reading CATHR.