Because Bush/Cheney is unwilling to take the DPRK off a terror watch list, as it has promised, they have stopped dismantling their facilities, and are threatening to reconstitute them.
Because Cheney wants to swing his dick around*, about the only thing remotely like a positive foreign policy accomplishment is about to go down the drain.
It’s behavior like this which make North Korea a paranoid nuclear power. It makes them believe that the US is just waiting to attack them.
*Sorry for that image.