Well, I don't know what Bible you're reading, but the best example of disaster preparation was actually ordered by God. What do you think the story of Noah is all about? It was about getting prepared to the "saving of his house".
Most of us don't have God speaking to us in an audible voice, saying "Get ready". For most of us we look at the state of the world (the signs of the times), we read the word where it says "as it was in the days of Noah", and we go with that urging within us.
Some people are saving strictly for the "saving of their house", complete with locks, traps and weapons guaranteed to keep outsiders out. While others are also preparing for those that come their way and are in need of help.
We live in an unstable world. One would have to be blind or in complete denial not to realize that the world is in a state of fluctuation. Nature is going crazy, rain, drought, earthquakes, floods, hurricanes, tsunamis and tornadoes. And if you forget about the devastation that nature can bring, what about the disaster that would follow a wide-spread terrorist attack?
Six years ago the government was telling people NOT to prepare. Since 9/11 the advice has changed to at least have supplies to see you through a 72-hour period. From my point of view that's a little too little, but then again it's better than nothing.