kid getting bullied fights back

theres been a lot of news coverage about people being bullied and then committing suicided. but this person decided to stand up for himself, and even though he did it through violence at least he did something about it. students tell they are being bullied all the time and in most case the teachers don't do anything about it. leaving the student to feel alone and lost, so instead of him doing something to himself he retaliated on the bully. this is something that bothers me a lot people are bullied everyday but nothing is done to stop it. in high school i always found myself defending someone being bullied. because you are unhappy with yourself you hurt others? it makes no sense to me.