That really sucks... But if that happened here, he'd be on trial for 3 years, get a death sentence and then be on death row for another 30. The freaks in the government would call for the registration and banning of all knives, including butter knives, and then the day after the attack, there would be 25 cops in front of every school.
In China... he's put on trial next week, found guilty and put into a prison where you'd wish that you'd be dead. If one of those kids happen to be a government officials kid, he wouldn't make it from the court house to the prison alive.