Gang war at Pretoria school

[Denouncer]

What would you expect the teacher/s to do? This is criminal behavior which the police should be dealing with

According to the rest of the article, the attack was motivated because of bullying at one of the schools, and this was in response to it. If anything, it sounds like it's definitely the schools/teachers fault for not responding correctly and ensuring the problematic pupils were suspended and dealt with before the situation escalated.