Conspiracy theories that might drive someone to violence are protected speech in this country. Many “conspiracy” theories have proved true, e.g. the CIA’s insane antics in the 50s-80s.

We don’t have a Committee of Truth that determines what is true and therefore legally speakable.

If facts or alleged facts drive people to violence, that is the responsibility of those engaged directly in violence (or actually inciting it).

Incitement in America is basically: “let’s go burn down that building right now”. “As a moral matter, someone ought to burn down that building” is protected speech.