Insurrection act.
https://www.law.cornell.edu/uscode/text/10/subtitle-A/part-I/chapter-13
Darn right.
Normal people would hold a 10 minute silent protest every day and go home.
But no, looting and killing brings proper attention to issues.
10 U.S. Code SUBCHAPTER IV— SUPPORT FOR OPERATIONS AND CAPACITY BUILDING
Whenever the President considers that unlawful obstructions, combinations, or assemblages, or rebellion against the authority of the United States, make it impracticable to enforce the laws of the United States in any State by the ordinary course of judicial proceedings, he may call into Federal service such of the militia of any State, and use such of the armed forces, as he considers necessary to enforce those laws or to suppress the rebellion.
https://www.law.cornell.edu/uscode/text/10/252