Schools are places of education - not an arm of the police. (Although I have known a few which thought otherwise...)
Schools at best should be informing the parents and/or police if the child tells a teacher. If not, as harsh as it seems, it's nothing to do with the school. The same as if pupil A had a scrap with pupil B over the summer holidays. Outside of school premises and outside of school time.
The internet doesn't need to be censored. For a start it's nearly impossible to implement. And why should it be? Who is to say what I can and can't watch? Blanket censorship just doesn't work - it's a way to look like something is being done whilst leaving the root cause alone. Don't try to ban websites as their content maybe illegal. Turn up on the doorstep of the host and do some real police work for a fucking change.