There's an EMP Threat?

A while back I looked askance at the assertion that Iran would smuggle an electro magnetic pulse (EMP) weapon into the U.S. Little did I know that there is an entire sub-culture dedicated to worrying about these weapons and the possibility of their use against the United States.

I don't know the ins and outs of the technology so I don't know if Robert Farley's dismissal of the threat is plausible on technical grounds. But that's all rather beside the point - it seems clear that such a device is far beyond the technical ken of al Qaeda. And in the event North Korea or Iran managed to perfect such a weapon, they wouldn't launch one for the same reason they won't launch a preemptive nuclear strike against the United States. It would be suicidal.