Freedom of speech is a complicated thing, and a lot of peope have trouble understanding where the line is, even though it is fairly clear in principle.

Freedom of speech "ends" when that speech is a mechanism by which another crime is committed. It's not the words that are illegal. It's what the words bring into action.

If you offer to pay someone to kill your wife, you can't get off by claiming freedom of speech, because you're charged with conspiracy to commit murder.

If you lie about the terms of a contract, the crime is fraud, not speech.

If you yell "fire" in a theatre and people are hurt attempting to flee, the crime is inciting panic, not rhe word "fire."

Ideally, telling an angry mob to march on the capital and "fight like hell" to prevent the certification of an election is fomenting an insurrection, not speech.