I don't think that the first amendment says anything about the value added by expression being relevant. If we were concerned with value added then we wouldn't allow most protests, since most of them don't amount to much more than a choir singing to itself. There is little value added by speech consisting of posters of (insert name) with a Hitler mustache sharpied on.
It's odd to see you on the "statist tyranny" side of things, cimarron.