I do not see any problem with tattos or piercings either. Some people might think these adornments are disturbing, but I think this is an exaggeration. I think the inital onset of curiosity would die down after a while. I do think there are certain things that should not worn by students, however. I believe tattos and piercings may upset some teachers because they forget how it is to be young.
Young people try to find their identity and express it.
It is normal and a positive thing. I knew a girl who dresses like Dianne Sawyer throughout high school. This same girl wanted to be a journalist, so I guess she was trying to express herself. Of course she did not get a lot of grief for dressing this way. Some people believe students should dress more presentable in order to know how to look in the real world.