2) people wearing t shirts with satanic images are probably even more upsetting to people of faith, but where have we heard of students being banned for displaying horned creatures with fangs and blazing eyes on their torsos or backs?
A t-shirt with a picture on it is fairly benign in itself if it doesn't say do 'this,' or believe in 'this' or else. A turban on someone's head is enough to make some people of another faith uncomfortable. Witness all the airport delays with passengers refusing to fly because of the attire of someone in another seat. Such religous based attire, or even a t-shirt displaying fangs and horned creatures, only suggests what the person wearing it believes, without the need to involve anyone else. Those examples don't explicitly say anything of any other belief. I mean, is this nuance we keep repeating here rocket science or what? Because I'm starting to think that by introducing the concept of what a person holds to be true, and which doesn't involve some else's belief system, or non-belief system as it were, versus the in your face statements like that kid's t-shirt, is like some technical manual complete with handy formulas and graphs from Einstein's chalkboard.