Intimidation, threats and bluffing does work when you are intimidating a country who stumbles around with leadership that is not willing to back up it's talk with action... We are sadly lacking in this area.
We should have already flattened N.K.'s launch sites, as well as the Iraninal nuke facilities.
We don't seem to hear any more BS from Momar in Libia... Gee, I wonder what the difference is???