Well for one it would be very disruptive and hard to justify. It would interfere with 911 and calling family and would scare and inconvenience the populace turn

Well for one it would be very disruptive and hard to justify. It would interfere with 911 and calling family and would scare and inconvenience the populace turning them against them and a certain safe 'status quo' apathy is what they depend upon. Social dynamics aside more people on the streets makes their job harder regardless of their demeanor - which they will if they need to go in person to check on others. The disruption to service would also be very expensive to businesses which would be encourage flight. "And we lost this multi-million dollar contract sale because the cell service to reach us anywhere went down for three days, a worse case for the company than even if rioters burnt down the whole office. Why are we located in this shithole again?"