This is but one of the many many fears we live with today. Read some of the organized fears in this link:
List of conspiracy theories - Wikipedia, the free encyclopedia
I am not sure who if anyone benefits from these delusions, but I am sure they are nothing but destructive to the way should be living. They go against the teachings of my faith and my love for my neighbors and all mankind. If these conspiratorial theorists would put half the energy given these doomsday scenarios toward helping those in fear we could all have a better existence on earth. I vote for not blessing your own little group and even stop with the building walls and bunkers around the US and start by saying GOD BLESS THE WORLD. I mean, it is 2012 and we still have folks talking like my CAVE vs your CAVE.