I was, at one point (and perhaps still am), influenced a bit by the argument - or supposition - that Life has no real meaning, so why not bail?
[By "influenced", I don't mean that I felt encouraged to commit suicide... I usually enjoy life quite a bit; but the argument makes sense.]
If there is no meaning to existence, and nothing to fear from ending that existence... then it seems irrational to submit to the slightest pain, or discomfort, that comes with living.
We often hear the argument against suicide couched in terms of how it would hurt those we left behind... but that flies directly in the face of another popular argument which states that it is our Life, and we have to be true to ourselves (Yes... I note the irony, but the principle is similar enough...).
I dunno... My mother committed suicide when I was a kid and, though I wish she were still around, I have no evidence that she did the wrong thing.