The list author says: "Preparation is a good thing, right? (It's always frustrating to have the lights go out, and not have any candles...) And self-reliance is also a virtue.
But some people (call them "Preppers," or "Survivalists") take this to an entirely different level: preparing themselves and their families for the possible aftermath of a natural disaster (e.g., Hurricane Katrina), terrorist attack, or other near-apocalyptic disaster.
Latter-Day Saints (Mormons) have always been encouraged by their Church to keep a 1- or 2-year supply of "Emergency Food Storage" on hand; and many people built up supplies or created "survival retreats" during the Cold War days---when the threat of nuclear war seemed very real---or when Y2K seemed like it might be the harbinger of the collapse of civilization.
But a number of authors have and are still encouraging people to be prepared in case of ultimate disaster. Here is a list of some such books... which make interesting reading whether you actually create your own "home defense system" or not."