This tweet, while in bad taste IMO, was a threat to those who are planning to continue looting and burning buildings in Minneapolis.
I’m not sure if you’ve seen the videos, but there are full scale riots. Rioters completely looted a Target and burned it nearly to the ground.
Is “shooting” the answer to that? Probably not. And hopefully the National Guard is not going to do that.
But at the end of the day, this is the commander in chief making a public statement, and Twitter is editorializing it. Make of that what you will.
The US is a federated country. The governors of the states have the ability to call in the National Guard to protect their state if they can not use Local/State law enforcement.
If and ONLY if that doesn't work can the State Legislature/Gov formally ask the President for help by calling on the Insurrection Act.
It's actually one of the core tenets of federalism.