I read of that story on Equestria Daily. Even when these things happen, it won't stop bullying as a whole. It's good that you found some outlet for these frustrations, as bottled up they can eventually come up violently. I used to be picked on in elementary school for being "the smart kid". I was eventually able to get over that, and even became close friends to the main guy behind it. I'm pretty sure that experience is rare for anyone else.
Although I have found that I'm capable of imagining horrible things happening to bad people I feel deserve it, and quite honestly I scare myself with what I think up. As long as you're able to take control of your anger and eventually let it go, you should be alright.
But this kid was only eleven! He likely wouldn't know how to handle this.