School should limit access to the internet because many students would abuse it. For example, if we allow the students to have access to youtube or other websites that contains videos, they might grab the opportunity to watch obscene videos like pornography.
The internet that children use does not need to be limited or taken for that matter. Some kids don't have phones or anything to use besides maybe a Facebook messenger. And you can't get on Facebook with limited access. Plus teachers take it to seriously. Our school uses 3 Internets. One for staff, teachers, and then students. So that if the kids use the internet for downloading then all get punished anyway because it then goes slow. So, it is a common mistake that kids do those things. Plus even if they were to do those things. Its a very high risk to get caught. Most wouldn't risk it.