Some of this disaster preparation stuff, to cover all contingencies, reminds me of a tale a friend of mine told me, years ago, when he flew reconnaisance in Britain during WWII. The Brits were told to black out their windows during bombing raids in order to deter detection by German aircraft.

Great idea to make the population feel that they were doing something of value in order to protect themselves. Only trouble was, during the winter, when flying over blacked out cities, the chimney pots on every building glowed like welcoming beacons to anything overhead. The general population wasn't told about that small failure.