In any case, missiles will fly if you do this. Cities over there will disappear if you do this. Let the people in those cities know too. Maybe some right-thinking housewife will bonk Ahmed over the head with a frying pan to prevent certain destruction. Maybe some affected residents will tip off authorities to the perps to prevent certain destruction. They have to know that we mean it.
I understand your point but this is exactly what they want, it allows them to start their Holy War. I am not saying we shouldn't do this but a lot of factors need to be considered.
1) We are going to need lots and lots of oil. Once those missiles fly expect the price of oil to go through the roof.
2) Be prepared for secondary attacks in the US and US companies around the world.
3) It's now World War 3 or 4 (depending on what you think of the Cold War), it it won't end anytime soon. Something like this happens and China will look to take on Taiwan, if NK is capable they will go after SK and smaller regional wars will flare up in South America, Africa and South East Asia.