@Finn dAbuzz,
And do you know what this kid did to be arrested for "disruptive behavior" (in addition to refusing to take off the shirt)? The story doesn't say... which is why I think it is stupid to speculate either way.
Kids do get arrested from school for being a threat to teachers or other students. If the only reason was the t-shirt, then I agree that it was excessive. If the kid became a threat, then the arrest was warranted.
My only point is that reading into the story without the facts is ridiculous (unless
you are trying to push an ideological agenda without regard to the facts).