From Medium:

There’s a common misconception in the media about the eventuality for which the preppers are exactly prepping. That’s because they’re a diverse group, and prep for many different things. No, they aren’t planning for a revolution to overthrow the government. (Most of them, anyway.) Mostly they’re planning to keep themselves and their families safe while someone else tries to overthrow the government. That, or zombies. (More on zombies below.)