There are literally thousands of Americans, and some Aussies, too, that want to do this (and are doing it in some cases) . They are the survivalist bunch. Some to extremes; building underground houses with gun ports and other ways to keep the "hoard" at bay when teh world goes to H### and a handbasket.
The thing is, real survival is dependant on . . . . .
COOPERATION. That's how human being survived all hard times. Isolation is not a long term solution.