BREAKING NEWS:
Alien Invasion thwarted by beaming reruns of the Kardashians at them, till they realized this place sucks.
For a start, its impossible to build bombs from commercially sourced fertilizer. It's deliberately adulterated so it cannot explode.
Indeed, sensible people have realized the danger when old pops forgot he had a leaking diesel drum in the back of the truck when he bought 400lb of fertilizer, and drove though town during a lightning storm