I will never celebrate the death of a human being. I didn't even cheer when bin Laden was shot. (I remember thinking three things: "How regrettable that this was necessary," "Thank God that there are brave young men and women willing to do this horrible, regrettable but necessary job,"and "The crowds of people in the streets in the USA cheering bin Laden's death look exactly like the crowds of people in the streets in the Middle East cheering 9/11.")
I especially will not celebrate the death of a child. Bullies are dicks, and justly deserve appropriate consequences, but they do not deserve to die for it. (And it is true that no one has ever come up with a truly effective anti-bullying method in American schools. Which is a tragedy.) And while the title of this thread could be interpreted as celebrating the actions of the victim in this case, I'm not going to put words in the OP's mouth. In a nutshell, this entire scenario is a disaster for everyone concerned. There were no "winners" here. Not the victim, who is dead, nor the witnesses, who now have to deal with witnessing a bloody killing, nor the defendant, who must now somehow deal with being a killer.
I do not know if I ever killed anyone in NI. I certainly shot at a lot of IRA, and tried my best to hit them, and I'm pretty sure I did on more than one occasion, but I have no idea if they died as a result of my actions. And despite that.....I struggle emotionally today with the idea that I might have killed someone, and for no other reason than that my government disagreed with his politics. This young lad now has to deal emotionally with the quite literal blood on his hands. It sounds from the article like he was a bit of a sensitive sort (as most victims of bullying are), and I wish him the best in coming to terms with this.
In the end....nothing but a horrible tragedy for everyone. Perhaps the acquittal prevented further destruction and tragedy. I have no idea. Let us hope so.