First off, you are taking everything I say to the extreme. Being "prepaired" and being a dooms day freako are two completely differant things!
Lets talk about a terrorist attack for a second...
You do realize that no matter how far you are from a major city, you can still be effected by a major attack? All it takes is a nuclear bomb in a shipping container, and it will shut our ports down for weeks. Regardless if it actually goes off or not... as it will take that long to search all the containers for possible more bombs and to develop a new plan on how to deal with the fact that we dont search MILLIONS of containers every year because we dont have the man power.
I never said you COULDN'T get food did I? Im not sure if you have ever lived near an area that has hurricanes. But the moment people find out the storm will hit them, what do you think they do? Run to the store in a last ditch effort to buy whatever supplies they can. So now, add the fact that if something on the scale of a nuke came into the US, dirty bomb, warhead, you name it. People will be out there buying up whatever they can, so why you would not at least be prepaired and have things you want to eat handy rather then getting stuck with some nasty GOYO beans or something I have no idea.
El Nat-ur-al baby...
Mother nature can be a b*tch! You said yourself the worst case for you is getting snowed in. Ok, you get snowed in, you have all this snow for water right? How you going to turn it into water? Your own body heat? You do realize this will cool you down correct? What about providing heat for yourself? Lights? Sure you got flashlights, but where are your batteries? Everyone always seems to keep these items in two seperate locations, so finding them in the dark becomes a challenge :p Keeping all your supplies in one, easily accessible area will make your life that much less stressfull as you try and run around and find everything.
Numbers... Also, you say "a few thousand", this number is so unrealistic its almost laughable. You do realize the whole goal of a "terrorist" is not just to take lives for whatever cause they feel is just... but its to create shock and panic to people who DONT die. Like everything, there is progression.... processor speed increase, hard drive storage space increases, and the mode in which people will attack will also increase. I read a news article the other day that brought up the fact that Al-Qaida already has 40 nuclear weapons... with papers recovered which mentioned they already had a plan that would kill nearly 4 million people. Being that 7.5 million people live in NYC itself, and another 15 million in the "spawled" area of Los Angeles, leads to point that smaller areas will also be targets, you attack the larger cities so people become scared and flea outward, and then bomb them where they feel safest.
Being "prepaired" can be as simple as having a plan, hey if this happens, this is what im gonna do. Its that simple, but you need to have the plan BEFORE something happens, and if you want it to actually be effective you need to think about things from various angles as well as do at least a little research. But have a plan, have fresh water in containers, have a way to heat up some food -- or like the taste of PBJ :p