SOmething that seems to be being missed out on here is that sometimes people who are not properly trained (and not that smart, either) find themselves having to deal with a suicidal person. And most of them do the best they can. (many many years ago I had a particularly volatile crew of friends and there were one or two incidents of people driving madly round houseing estates looking for Someone who had fucked off in hysterics with a bellyful of pills and a carving knife). WHile I do agree that longterm help for the mentally ill should be sought from a properly trained professional, I do sometimes worry about the dreadful passivity I see in a lot of people, the 'it's not my job, what if I get it wrong, ask an expert etc'. Experts fuck up sometimes too.
There are no guarantees, of course there aren't, everyone's just bludnering through the best they can.
But finally, posting anything including suicidal stuff (or ways to help the suicidal) on an internet forum means running the risk of responses that are flippant, unkind or idiotic, as well.