I'm not quite sure how a pro-life message (or any other political message) distracts other students from learning. If they don't like it, they don't have to associate with the kid. In this case, I've gotta say good on the courts.
The purpose of messages is to be read and influence the reader.
Children should be in school to learn basics like math geography history writing etc. They should not have distractions.
Do you think some people would be distracted by a student wearing a shirt with a photo of Hitler on it saying "He didn't kill enough of them."??
Or are we going to get into whether the message is politically correct or not. - tom