Freedom of speech has always meant that you can say whatever you please, in the sense that the speech cannot be rightfully prevented. Just because someone cannot gag you does not mean they can't slap you in the face after hearing what you say.
The freedom is about lack of prior restraint. It does not absolve you from the consequences if your words cause another to be harmed.
You can shout "Fire!" in a crowded club, if there is a fire in it. You can even shout "Fire!" in a crowded club if there is a bomb in it, hoping for a more orderly and less panicked evacuation. You can also shout "Fire!" in a crowded club if you like the Ohio Players or P-Funk. But if you make a false alarm and someone gets an injury in the resulting panic--even if it's just fewer sales at the bar because everyone left--you'd better be prepared to accept the consequences. And it isn't enough that your words could have caused harm, there has to be some actual harm and some actual intent to cause mischief.
So if you stand before a crowd and encourage people to run riot and sack the city, the consequences you face are going to be a lot different if that crowd is a rotary club meeting or if it is an unruly mob with pre-sharpened pitchforks. It is absolutely your right to do it, but if you do it with criminal intent, expect to be punished for the damage that you caused.
