Internet Filtering in Schools

I am in favor of Internet filtering. The Internet can be a dangerous playground if it is not supervised. I believe it is reasonable for a school district to ban pornography, criminal skills, gambling, and questionable chat rooms that online predators can access. I also think that the degree of which hate speech is censored should be determined at various grade levels.
Pornography, crime skills (including drugs), gambling, and general chat rooms need to be filtered at schools. Pornography is not a form of art, it is the belittling of people for purposed of money and entertainment. Pornography can be talked about in the classroom setting without having to display an example website on a computer. It is idiotic to think that a student needs to see a website to know it exists. Students encounter porn from simple searches of innocent material, like "Scooby Doo". My eleven year old step-son found a porn site while searching for basketball shoes. (I was over his shoulder during the search process and a site that looked like an online sporting goods store was actually selling online porn passes.) This same reasoning holds true for gambling and crime skill websites.
As for chat rooms, this can be a teetering subject. Chat rooms can be a great collaboration resource for students, therefore not all chat rooms should be filtered. So, schools should make their own chat rooms that only allow students to access it. Problem! Maintaining a chat room requires money and personnel resources. Also, savvy online predators will obtain access to these sites. It it is possible, have some school personnel either develop or find a chat room that they deem as satisfactory. Allow teachers to have an administration/god-like ability in the chat room. Students may think it is an invasion of the students' privacy to allow teachers that kind of ability, but students should only have privacy in the restroom when they are on school grounds.
As for hate speech, this should only be filtered at various levels of education. At the high school level, students should have some access to hate speech while under the supervision of a teacher. The teacher can provide some online material for students to get an idea of what it is, then the teacher can terminate the online source and lead a discussion on what was shown. This should only be accomplished at higher secondary educational levels, where the students can show some maturity skills. If the exposure causes a problem at the school, then the policy would need to be re-evaluated. Also, it could not hurt to have positive speech be shown to balance the hate.
The Internet can provide useful, educational resources to students. It can also be used to the detriment of students as well. Schools need to be careful what is displayed on the computers, but these schools, also, cannot dismiss this resource.