I wish I could remember the book, but it was targeted at preppers by someone who'd lived through a temporary collapse of government in S. America. And his advice was if you are truly a prepper, you aren't storing guns, ammo, and food, you're working to get your local government to prepare for disaster events. And his reasoning was this, as soon as the central government failed, the smaller towns created militias which went around collecting food and supplies to be rationed by everyone.