Reminder that the authority under which the the US military is deployed against US citizens was intended to be used in exceptional (extreme) circumstances - ostensibly because no other options would suffice.
The Insurrection Act authorizes the president to deploy
military forces inside the United States to suppress rebellion
or domestic violence or to enforce the law in certain situations.
The statute implements Congress’s authority under the Constitution
to "provide for calling forth the Militia to execute the Laws of
the Union, suppress Insurrections and repel Invasions."
It is the primary exception to the Posse Comitatus Act,
under which federal military forces are generally barred
from participating in civilian law enforcement activities.
This is the heaviest hammer in the toolbox. Deploying it against citizens he doesn't like because he resents their message is a historical display of bad character and is profoundly unethical in a way that the harshest adjectives struggle to reflect.