Somewhere in Arizona, a man I have known for less than 24 hours is teaching me how to kill a human being with a shovel. Or, should I say, a special customized shovel whose left edge is an axe blade. “Keep it straight at the target, bring it right to this point, and then” — the device, 26 inches long, goes hurling toward a tree stump, the blade spinning end over end — “straight through.” That’s Tim Ralston, 49, apocalypse salesman of the year. Before he put a shotgun in the trunk of my car, blindfolded me, and took me to this undisclosed location two-plus hours from Phoenix, he invented the tool we’re throwing. This one product has helped him make more than a million dollars in 2012 selling to people who think America — or the entire world — is at risk of collapse. The Crovel ($109.99) was conceived as a survival tool for the mashup age, a Swiss Army cudgel that could make Switzerland seem fearsome: half-crowbar, half-shovel, all testosterone. But as the device has gotten more profitable, it has also gotten more violent. There are now 11 other tools packed in there: axe and saw blades on opposite sides of the shovelhead, a hammer, “zombie spikes,” the usual. What began as a utility is now a weapon. This is what Ralston’s customers demand. They don’t just want a shovel with a crowbar, they want a shovel that can kill somebody. He sells to “preppers” — people preparing for The End of the World As We Know It (T.E.O.T.W.A.W.K.I. in prepper parlance). Preppers have two defining characteristics: They’re afraid, and they’re doing something about it. It’s a subculture that’s rapidly entering the mainstream, emblematic of a country casting about for its role in an age where the United States is less powerful and more insecure. The Crovel is made of power and security. Preppers include everyone from paranoid conspiracy theorists to suburban moms; anyone, really, who’s assuaging their nerves by having a backup plan. Those plans almost always take into account what happens if, in the face of disaster, society splinters apart instead of comes together. What happens when the survivors turn desperate; what happens when you have to provide for and defend your family?