Just take out one major truck artery and see which "immune" communities are really immune.
Come on now, you should know better than that. Would you consider the Grapevine (that is the main highway north out of LA connecting it to Northern California, Oregon, and Washington) a major artery? I would imagine so. So last year when it snowed real bad over the Grapevine and it was closed for two days, why didn't our communities shrivel up and die? Oh because they re-routed the trucks onto the 58 and down the 14 back to the 5 in Sylmar. I think you would be hard pressed to find a truck artery anywhere that didn't have a way around it. Sure it might take 2 extra hours or more, but there is still a way around it.
Pretty much Los Angeles could fall off the face of the earth and it wouldn't hurt us too much. Sorry. Its not like we get our water from Los Angeles. Wait actually it is the other way around, so actually if LA disappeared and there are still elk and deer to eat in the hills 30 minutes away, I think I would do just fine for a while, afterall without Los Angeles sucking all of our water dry, we might actually be better off. Ah, but we would probably be short on food and textiles! Oh wait, Kern County and the rest of the central valley feeds a good chunk of America. Ah, but we would have no beef! Darn it, I forgot about Harris Ranch and the hundreds of other ranchers all up and down the central valley. I got it, OIL! We couldn't live without Los Angeles's oil. Oh wait, again Kern County has quite a bit of it and there is always the ANWAR in Alaska.
No, I am quite content living in the sticks and if something does happen in a major city, I don't think it will stop life as we know it. And if you want some proof, how does 9/11 sound? The entire airline industry shut down for what two days? I still got paid at the end of the month and didn't starve.
I think we give these terrorist acts too much credit some times. Sure a nuke would be pretty serious. Bomb a few cities, people will go on and I would think especially in the rurual areas where we aren't concerned about big city folk. Sorry if that sounds harsh, but that is why I don't want to live in Los Angeles anymore.