As the victim of 5 years of systemic and oft times rather violent bullying throughout my high-school years, I know morally I should be outraged, but personally I am quite content. You can't reason with a rabid animal, you can't ask them nicely, you can't use harsh words or simple "punishment" like detention or suspension. The animals don't care. They only understand power and follow-through. They got exactly what they deserved. And they will back off, because rabid animals know when to be careful after they've been bitten.