For a law and order President to ignore the law? Yes, he should not be taking federal action unless the State requests help.
If you have a problem with Atlanta, Minneapolis, etc. - the problem is with the State and if they can’t handle it - ask for assistance.
It would take no longer then an hour for the Governor to (a) call up the National Guard, and (b) transmit a request to the White House for centgov assistance.
Remember the unlawful intervention of President Trump now, will be the basis for future Presidents to unlawful interfere with internal State matters when a different President is in office.