Do you have the right to falsely yell "FIRE!" in a crowded theater? Yes, you do. You have a responsibility to not do that, though, to be sure. Here again, I must state that rights are non-negotiable; not subject to restriction. Don't get yourself in a self-righteous knot, though. This is not quite the same as shooting people since the other people in the theater have some control over whether they panic and stampede or not. Still, if you cause a panic and people are injured or killed, you will be held accountable. If a theater owner wants to make certain that you do not cause a panic, would it be within her rights to cut out your tongue before allowing you into the theater? Not at all. She could tell everyone that false alarms will not be tolerated and if you cause one, you will be held financially responsible for any damages, and will face punishment for any harm that your actions cause anyone. If you have done this even once, I am quite sure you would not be welcome in any theater that knew of your actions. You should not be punished for "crimes" you have not yet committed, nor should you be denied your rights or property in order to prevent you from committing these potential "future crimes". Unfortunately, this is what the US police-state attempts to do. It is the entire foundation of victim disarmament "laws".
The First Amendment forbids government interference with speech. It also quite obviously protects your freedom to air your disagreements with the government or its indigenous vermin. I believe that freedom of speech is specifically about protecting unpopular speech. If just about everyone agrees with what you have to say, no one would be likely to try to stop you from saying it. If, however, your words are inflammatory, then dictators are likely to try to silence your dissent or to put you in a "free speech zone" where your words will have less of an impact if they are heard at all. Remember this when you hear authoritarians talking about "hate speech" or "religious extremist speech". Whether you agree with what is being said or not, do all you can to protect the speaker's right to be heard. You may be next on the list to be silenced.
