I love National Review; I read the hard copy regularly. But "be afraid?" Nope. I refuse. I would hate to see a nuke hit us, but I guarantee you if they fire such a missile at our nation, North Korea will be glowing within 48 hours--and the glow will be strong enough to provide light for the entire Peninsula.
Instead, we should work to implement a change in that evil regime.
Would the rest of Asia/Red China be able to predict and track where our North Korea bound Nukes were going. Would Red China launch thinking that we were trying to hit them? Would our new friends in Russia and Pakistan try and do a little nukeing at India or China? Would there be enough EMP to blind our intel from finding if Iraq or others launch at other nations. I think a little fear is in order.