If the guy actually snuffs himself I hope all the people who made light of his situation never be able to sleep at night ever again.
Sorry if it bugs you, but I'll be sleeping just fine for the rest of my unsuicide-shortened life. As long as he doesn't take out a school full of kids on his way, it's his choice. Besides, he said he was cutting himself in his second or third post - obviously he'd already made up his mind and was just spending his last minutes painting the keyboard red. No point arguing about it or trying to talk him out of it now.
Besides which, if he were your friend, would he hurt you by killing himself? I'd hope he wouldn't - if he does, then he wasn't much of a friend to begin with.