Let the principal make the call.
"I agree. A policy of "No printed T-shirts" teaches the kids nothing about judgement or personal responsibility. I'm tired of this "zero tolerance" BS.
Let the principal make the call."
Problem with that is that the principal of your school may be a screaming liberal. So, he'd allow the gay rights T-shirt, but not the 10 Commandments one.
Not all principals are principled, if you know what I mean.