If your store is looted, don't call the cops. They have already been there.
Easy for us to say today BUT..., in today's litigious society, any cop following such orders would quickly be the target of a lawsuit/prosecution for using "unreasonable force" and violating the perps' "civil rights"!
I am old enough to remember when the National Guard entered disaster situations CARRYING LIVE AMMUNITION and the order to SHOOT LOOTERS ON SIGHT meant what it said (remember what that cost them at Kent State???)!
Now, only if you are lucky enough to live in a state which guarantees your personal right to protect yourself and your family with deadly force, do you have any real rights! Police/National Guardsman are NOT protected in a similar manner and probably will never be again until REAL TOTAL ANARCHY is present!