...because that's how Jack Smith charged it. Are there alternative charges that do not require proof of knowingly lying as a separate element to harmful or gainful result?
Not insurrection.
Not treason.
§2384. Seditious conspiracy
If two or more persons in any State or Territory, or in any place subject to the jurisdiction of the United States, conspire to overthrow, put down, or to destroy by force the Government of the United States, or to levy war against them, or to oppose by force the authority thereof, or by force to prevent, hinder, or delay the execution of any law of the United States, or by force to seize, take, or possess any property of the United States contrary to the authority thereof, they shall each be fined under this title or imprisoned not more than twenty years, or both.
Truth or Lie doesn't matter! That is the crime that the most dangerous of Trumpie's Jan. 6 co-conspirators, like Oat Eater Elmer Rhodes and Proud Boi Henry Tarrio, were convicted of. Why didn't Smith charge Trumpie with seditious conspiracy?