To me, C8hWgwo5YeC5ojiOaDe3JVaLev+3zaZDfRVTAjvqNCA= is a lot less harmful than shouting "Fire!" in a crowded theater.

Banning C8hWgwo5YeC5ojiOaDe3JVaLev+3zaZDfRVTAjvqNCA= is akin to banning shouting in a theater, for any purpose. In particular, the banning of political speech is highly protected. One cannot readily show that C8hWgwo5YeC5ojiOaDe3JVaLev+3zaZDfRVTAjvqNCA= is not political speech (and indeed, here, it is).