Oh my goodness, who are they planning to shoot? One bullet for every citizen in the USA, and some to spare.. huh!?
Or maybe they are fearing a revolution?
Imagine if an excellent demagogue came along, someone who knew exactly what strings to pull with Americans, someone with real populistic appeal. If all the poor people, everyone who is worried about the future and all radicals joined up, then something could happen. And in the USA every other person owns a gun.
Perhaps the Department of Homeland Security got nervous by Occupy Wall Street.