I'm going to tell you what happens when SHTF for real, earthquake, civil unrest whatever.

When stuff really goes bad, govt will not respond with aid for minimum of 6 weeks, during that time the people are on their own, cops on their own and local govt on their own. At 6 weeks any cops left, and govt left will rally at local jails and prisons, where military will take control of those facilities via air assault. Command and control will be run from the jails.