I hate when people use this metaphor. Not because it's inaccurate to say that speech can cause imminent harm in some circumstances. But because its origin was a Supreme Court opinion that argued against the right to speak out against the draft in WW1, which I don't think too many people using this analogy today would agree with. Also, this legal argument has been rejected since then.

Point is, this exact argument could be (and has been) used to justify some pretty bad ideas.

https://en.wikipedia.org/wiki/Shouting_fire_in_a_crowded_the...