Everyone knows what happened.
Iraq did about 10% of the terrible shit North Korea has done.
Iraq - rumored to have WMD, ended up with 500 expired shells from 1985 in a bunker. Let UN search his country, and they found nothing.
N. Korea - fires test missile directly at Hawaii on the 4th of July, blows up a nuke underground, tells the world they will destroy the US.
Which country is a greater threat here?