Should students be allowed to wear "satanic" symbols to school?

[Infinitum]

What does "need" have to do with it? What if someone simply wants to wear a religious symbol?

Not necessarily, but it's good to be aware of one's underlying reasons for it. It can be purely aesthetic (like in my case, I wear a simple Ankh nearly everywhere) or it can be something else. What I'm trying to say is that in many cases looking into the "something else" should weight in on whether to wear religious symbols anywhere, not just at school.