I wonder if the South Koreans are getting the connection to the rocket attacks....arent they on the receiving end if North Korea decides to attack? Does NK have rocket or artillery. I suppose artillery would be worse if it is more accurate.
Short of nuking NK, I think that to win a war with NK the US and South Korea would have to evacuate the entire Seoul metro area and move everybody 40 miles south of the DMZ. Then we'd have to line up a huge bomber force and pound NK's artillery with large bunker-buster bombs in big numbers very quickly before NK could destroy Seoul. It would be difficult to do this without using tactical nukes, and there you see why there have been no military strikes on North Korea.
If you're interested, this subject is covered in great detail, along with many other astounding facts, in the book Rouge State by William C. Triplett. After reading that book, my view is North Korea is an axis of evil all by itself.