Smartmeters can instantly at specific individual addresses pull the plug on anybody and everybody getting out of hand. Whole communities can be shut off until they give up and hand over their freedom fighters.
Food chains can be interrupted and distributed only to the complaint and their controllers.
There is enough information stored on each citizen to allow algorithms to instantly database sort (let live/re-educate/exterminate) every man woman and child.
Total spectrum dominance, the fence around us is already built, the gate is still open but can be slammed shut in the blink of a wink.
Militarized police need only direct traffic.
This is the 21st century way to enforce martial law. 9/11 was all about getting the fence built in time.