I always thought that was a silly argument, the Fire in a theater thing. The theater is private property. If you jump up and yell anything and disturb the patrons, you will get kicked out.
Wow on the Breyer reasoning. Because Muslims have shown that they go ape-s**t about the Koran, burning it is the equivalent of the old “fire in a crowded theater” line? So the effect is that practitioners of religions that aren’t as ultra-violent don’t get the same protection of their sacred text from desecration. And THAT wouldn’t implicate other Constitutional protections as interpreted by his Court? Does he realize how his pithy line plays out?