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There should be no limit to freedom of speech.
You should not be allowed to cause physical harm with free speech (e.g. shouting "FIRE!" in a crowded theater where there is no fire).
The issue is not the speech itself, as a play about pirates may have a scene where the captain yells "Fire." It is the alternative laws surrounding the content of the message that makes it illegal.
Words do not cause physical harm. The example you provided would be inciting mass hysteria, not harming a person physically.
Yelling "fire" in a theatre isn't a crime to do with speech, but rather an action of creating a public hazard, or criminal mischief. A patron can "say" what they want, but when they start yelling and motioning hysterically, it's the actions causing the crime.