It doesn't take an end-of-world scenario for 2010, 2012, etc. to have concerns. It only takes looking at the continued rise in cost of oil and coal, the continued actions of this administration and other special interest groups to restrict oil and coal usage and availability, and the ongoing recession to have concerns that food and other needs from overseas and across the state may be unavailable for a week -- or 50.
Chinese officers publishing books explaining how to attack the US to position China, militarily, as the world superpower, Obama's struggle to make America a third world nation, economically, and the continuing fervor of Muslims around the world to suppress the non-Muslim, and it gets tough to feel secure.
Some folk make keeping a year's supply of food in the pantry an article of their faith. Others are working toward living from their pantry as a means of knowing what the chemical, biological, and genetic components are of the food they eat.
Some fear that the coal and oil needed to generate the electricity America consumes each day, and the oil needed to construct, service, and maintain traditional and alternative energy sources, are inadequate for growth, and may be actually dwindling, since 2005, to think we have enough to continue at this amount of energy, let alone rebuild our dwindling reserves.
Note that we are discovering oil at 1/4th the rate we use it today, worldwide, and nothing the US does, not even stopping using any oil at all, will change that significantly. And it takes a decade or more to get a new field into production -- and Obama has done everything he can to interject a four or eight year "pause" into that pipeline of bringing oil from new wells and fields to the marketplace.
No, the greater fear isn't a 2012 massive event. The real scare is the economic and resource crisis we build today, in Washington, DC, and in an America not focusing on reducing energy usage. We aren't moving closer to work, we aren't growing more vegetables in our gardens and farms than we import from Chile or New Zealand, and we continue to sell refined metals (scrap) to China, when we know we cannot afford the energy it takes to mine and smelt new ore to replace it.
Myself, I like the argument that knowing and working with your neighbors is a good approach to security; thieves last Friday swiped my own hunting rifle. Big arms cache's will always be a strategic target for any organized pilfering, whether IRS or militia or garden-variety thug.
Note that Alice didn't read Dilbert's list of preparations, yet she knows he has no defensive weaponry. Which means she's already scouted out his home to the extent that she not only knows about his lack of weaponry, but she has also inventoried his supplies and noticed the lack of protein bars.
And I don't think for a minute that Alice is planning to share Dilbert's stockpile. She just doesn't work that way, nor does she care about Dilbert enough to allow him to consume "her" supplies (once she takes them they're hers, right?).
Guns work better if you have more than one person, so perhaps Dilbert should invite Alice over. You want to outnumber Wally. With the coming financial collapse, food won't be the big problem. The big problem will be imports.