To the contrary the entire thing makes perfect political sense. First it defines a clear enemy, something that up till now the administration has been haveing trouble defining. Use of North Korea allows them to tie missle tech to terrorism, however stupid that is, and therefore jsutify the obselete Missle Shield. Iran ties in islamic extremeism, its all good.
Ut - China throws its weight around too - remember the "testing" of missles by firing them over tiwan? Just to point out one exmaple, and yes is involved in human rights abuses etc, but hey - we trade huge volumes thrhough them - of course they are not "evil"