I don't think this kind of thing will ever stop. If people are capable of killing others, then of course they're capable encouraging others to kill themself, and I think that the entire world has become a little bit more liberal about suicide all together.
It may not have been anyone's fault but his own, but if even one of these people had thought to react and contacted the police instead of egging him on, it could have been their fault that he lived, and was able to get some help with his problems and progress with a better life.
And I think that's the way for everything, not just suicide. If instead of teasing, or taunting, if they'd just have an ounce of compassion and support people when they're having a hard time, or to stand up for someone who needs help, if people would just stop to consider that we're all human beings for just 10 seconds before they said a word, or threw a punch, we might live in a better place.
I personally don't understand this need to degrade others or make them feel bad. I really don't.