This sort of shit happens because of poor parenting, and slackness from schools and police.
When I was about 14 the 5 or so Aussies in the school full of wogs were always having a go at me. There was one little shit, Wayne, who was the worst, along with his buddy Sully. I was always being challenged to fights, my response was, "COME ON YOU **** I'LL TAKE YOU ON RIGHT HERE RIGHT NOW!!!" and him and his mates would go, "oh no, after school, out the back here."
And of course I'd go out the school the other side that day.
Next day, "Where were you?"
"I saw that you had your 4 mates."
"Oh they were just going to watch."
"Right, so if I'm on top beating the shit out of you, they'll stand by and do nothing? Good mates."
"Aw naw but..."
And so it went for a while.
I told teachers, nothing happened.
One day we had PE, running around the park. Seeing as the useless PE teacher was sitting in the bus 1km away, Wayne decided to have a go. I tried to walk away, but all the other kids gathered around. "Fight! Fight!" Neither of us was really interested at this point, but they kept pushing us back in.
One guy knelt behind me, another guy pushed me over, as I fell back I landed on my wrist. I stood up, ready to have a go at the guy who pushed me over, he looked scared and ran away. Everyone started scattering except one or two who took me aside, "Sit down here."
"What? I'm okay. Hey why does my wrist feel floppy?" Two minutes later it seized up.
Off to the PE teacher. "Yeah I think it's a sprain... bind it up, wait over the weekend."
Turns out, greenstick break, radius and ulna.
Wayne got suspended, nothing happened to the other boys. I went to the principal. "He actually never touched me, it was the other boys."
"Well he still did wrong."
My mother sent medical bills to the school, they passed them on to the families, only Wayne's family paid up. The school did not follow up on this.
A week later, cast on my arm, I was called into the principal's office. "I hear you've been talking about getting revenge for your broken wrist."
"Yes."
"You should leave this up to the school."
"But you have done nothing, in fact worse than nothing, you punished the innocent guy and did nothing to the others."
"Jesus teaches we should turn the other cheek."
"Put your hand on the desk, sir, I'll take that metre ruler and break it, see if you feel like turning the other cheek."
I was suspended.
Schools are run by pussies, they are pussies because they're worried about being sued by moron parents who are all convinced that Little Johnny is actually an angel and a genius and he's just not appreciated by the evil teachers. It comes back to the parents.
Fat kid did the right thing, little shit had it coming to him. If parents and schools had their shit together, this stuff wouldn't happen. If my child bullies anyone, they'll soon be sorted out by me. And I will certainly expect my kid to step in if someone else is being bullied. If my kid comes home with film to put on YouTube, I will smack them across the back of the head and ask, "Why did you just stand there watching, idiot?"
You should always avoid violence if you can. Violence is certainly a solution, but it's only a first resort if you're a moron. Always walk away if you can, or seek the help of others. But if you can't walk away, and if others won't help, well then you have to help yourself.