If I were to come up to you, dead serious, and say "I'm going to fucking murder you", in many states I'd be entitled to pull a gun and waste you because you threatened me. I didn't infringe on your rights because your speech was used to threaten me.
One cannot simply go into a theater and shout "Fire!" and claim it is freedom of speech.
If I were to say the N-word around a black person, and he assaulted me, not only would I be able to sue him I'd be able to press charges for assault. If I went directly to a black person and called him that word, he'd be unable to hit me. If I went up to him, leaned close, looked him in the eyes and said "You watch out, N-word", he'd then be able to beat the living shit into me because I threatened him.
Freedom of Speech includes the freedom to be an asshole. The entitlement to self defense includes the ability to attack someone when threatened verbally. They're not exclusive.
As with every right, there are limits. Threatening people, inciting panic or violence, or infringing on someone else's rights are not granted under freedom of speech(Or expression or assembly etc.)
Freedom of Assembly is getting together for a political function. Freedom of Assembly is not getting together a mob to lynch somebody.
Why is it that the freedom of speech argument gets applied almost exclusively to things that aren't worth saying....
Not meaning to start a big political argument here but you are aware that America's historical relationship with meaningful freedom of speech hasn't been a happy one.
What is and isn't worth saying is purely subjective. The point is that what someone believes doesn't infringe on somebody else's rights.
I don't know anything about "exclusively", one would think if you try to silence a "meaningful" statement the same arguments would be made. Which is the point, again, of FoS. That it protects everybody's rights to say whatever they like, especially if you disagree with it. With some exceptions, obviously.