This is so dangerous. Shutting down the INTERNET worldwide would have more drastic affects than a small nuclear explosion would have. Even if you don't think the top echelons would use this for nefarious purposes, I doubt the US government is competent enough to manage these abilities. I back this up with a bankrupt economy; we're stretched so thin and the government isn't even capable of keeping a website operational, and the NSA isn't strong enough to protect from people literally just walking away with classified information. No one should have this power.
"The most important thing in a man is not what he knows, but what he is." -- Narciso Yepes