Can we please stop using this worn-out excuse for censorship as if it were some deep insight? It was indefensible back when it was first invented to justify prosecuting people for protesting the draft. It's just plain sad that people still parrot it to this day.

First, even the people that invented it for reasons of political expediency didn't take it that far. You can scream "Fire!" if there is an actual fire.

Putting that aside, even if there isn't an actual fire, no one dies because you scream "Fire!". They die because people panic and trample them in their haste to escape. That isn't a matter of speech. The responsibility for that harm is on the people that panicked—just as it would be if the fire were real. The appropriate response to a call of "Fire!" in a crowded space is to make a rapid but safe and orderly escape without trampling anyone, whether the fire is real, feigned, or an innocent false alarm.