I absolutely agree that being part of a cohesive group is to your benefit, and I'm down to get out of the house once a month for a get-together. As far as the dividing line between preparedness and paranoia, it's pretty tough to call. If I spend six months' salary to buy a rifle, a pallet of MRE's, and ammunition, you might say that's prepared, or you might call it paranoid. On the other hand, if I was uber-wealthy, I might spent 3% of one month's paycheck to stock a warehouse full of food, staffed with medical personnel, private security, and a lead-lined, underground bunker. Which one of us is prepared, and which one is paranoid? For me, the line comes down to at what point does preparing for a disaster start to negatively impact your ability to live your life? If you can't go outside for fear of something bad happening, you're in paranoia country. On the other hand, being "obsessed" with it doesn't necessarily make you paranoid. If preparing is your hobby, more power to you. That's the weird thing about people, they won't think anything of a guy who spends ~6hrs a day, two days a week at the golf course, and drops a cool grand on a new set of irons; but if you spend six hours on a Sunday reloading ammo and drop a cool grand because you found a sweet deal on reloading components, they start to think you're nuts. The time and money you've got sunk into one hobby is the exact same as the next guy's, but I guess one is more socially acceptable than the other.
I'd love to get together and discuss all this kind of stuff. I'm not going to be converting my backyard pool to a self-sufficient food source, but I do need to get a store of basic supplies laid in. I found a manual put out by the Mormons the other day that made some pretty good points. I've always thought it would be a good idea to have a bunch of MRE's around, but that manual pointed out that you can lay in a supply of food for an equal amount of time more easily by buying things like rice, grain, etc. Then it has the added benefit of being self-replenishing, because once you establish your 1 month, or 1 year, or whatever supply of food, you just live off of it, and replenish it with the weekly shopping trip. That way you know how to prepare the food, you're used to the diet, and at any given moment you've got a full supply, plus or minus a week's worth of groceries.
Incidentally, the topic of self-reliance is something I learned growing up on the farm, and I think the most useful two things you could have in a bad situation is a good dose of common sense, and the ability to use your hands for something other than glove racks.