Why do we censor in Schools?

Censorship is good when you are denying potential rapists access to child pornography.

Has some study been done that linked watching porn to raping people? Cause I don't remember anything like that, you'd think it would have been news.

I'm personally in favour of eliminating censorship entirely, and relying on the trustworthiness of sources to determine whether to believe what they say or not. If someone's consistently lying/misinforming, it is not hard to find out, when you have free access to information. Defamation should be taken care of at the discretion of the victim, not some sort of vague ban on speech.