>The line between what is permissible and not subject to control and what may be made impermissible and subject to regulation is the line between ideas and overt acts.
>The example usually given by those who would punish speech is the case of one who falsely shouts fire in a crowded theatre.
>This is, however, a classic case where speech is brigaded with action. See Speiser v. Randall, 357 U.S. 513, 536—537, 78 S.Ct. 1332, 1346, 2 L.Ed.2d 1460 (Douglas, J., concurring.) They are indeed inseparable and a prosecution can be launched for the overt acts actually caused. Apart from rare instances of that kind, speech is, I think, immune from prosecution. Certainly there is no constitutional line between advocacy of abstract ideas as in Yates and advocacy of political action as in Scales. The quality of advocacy turns on the depth of the conviction; and government has no power to invade that sanctuary of belief and conscience.
In other words, the court rejected the applicability of the analogy to the case at hand. They didn’t draw the conclusion that deliberately causing stampedes in theaters is protected by the First Amendment.
https://scholarship.law.wm.edu/cgi/viewcontent.cgi?article=1...
The replacement standard instead excludes protection for speech that is both "directed to" and "likely to" "incite or produce imminent lawless action," and these things are construed quite narrowly.
So: it's a bad analogy that was never the actual legal test, doesn't match the current test, and references an overturned case. But that doesn't mean it's actually legal to knowingly falsely shout "fire" in a crowded theater intending to cause a panicked stampede (though note there's more detail about intent and knowledge given there, and there would be other questions).
To a certain extent, trying to stop people referencing this really doesn't matter, though. If you got all the country's internet commentators to talk about "incitement to imminent lawless action" instead, they'd be in all likelihood deploying that phrase in the same places they currently use "fire in a crowded theater" or "clear and present danger." Eliminating this one analogy isn't really going to move the needle on people's understanding of what the First Amendment protects, but the phrase is both enduringly popular and a bugbear of the kind of people who care about this stuff, so the arguments and corrections will continue.
Edit: See here for a more nuanced perspective: https://www.mentalfloss.com/article/627134/is-it-illegal-to-...
Shouting “Bomb!” or “Gun!” in public would put you in a similar situation. In May 2018, for example, officials had to evacuate part of Daytona Beach International Airport after a man ran naked through the building screaming about a bomb in the women’s bathroom. There was no bomb, but he was charged with “false report of a bomb,” “criminal mischief,” and “exposure of sexual organs,” among other things. In that case, no self-respecting lawyer would advise him to claim his actions were protected by the First Amendment.