Sedition is easier to prove and document versus treason, like with their own words on paper, the internet or videos of them actually committing acts of sedition on tv.
U.S. Code › Title 18 › Part I › Chapter 115 › § 2384 18 U.S. Code § 2384 - Seditious conspiracy US Code
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.
(June 25, 1948, ch. 645, 62 Stat. 808; July 24, 1956, ch. 678, ;1, 70 Stat. 623; Pub. L. 103–322, title XXXIII,;330016(1)(N), Sept. 13, 1994, 108 Stat. 2148.)