Some people commit suicide because their life sucks so much they don't want to deal with it any more. People should be afforded the dignity to make their own choices without pseudo-altruistic nannying.
Others do so because they are defective. Selfish, attention-seeking losers who want everyone around them to be part of their pity party. Screw them. The gene pool is improved by their departure.
Oh, by the way, I have personally witnessed a suicide. A roommate blew his brains out in our living room because his "pain management" doctors couldn't manage his pain (neurological disease). I regretted his situation, but I respected his choice. I wished him godspeed as he gurgled his last auto-reflexive breaths.