Each author expolores scenario lines of possibility in new ways and either resolves or destroys the problem facing the characters.
In the book One Second After the way the local elected officials decided they were in control is a real possibility. When the county who ever decides to declare marshal law in your area what do you do when they want all your stuff, (guns, food & shelter).
Each state has an Emergency Management Plan that includes every county & municipality. I think it would be worth while to read your local plan.