Thanks for the ping.
An utter defeat of Iraq, with its biological weapons threat, is the best way of neutralizing the risk from North Korea, Iran, etc.
The reason there is a risk at all is that the world thinks that the U.S. is a paper tiger, that we do not have the political will to respond appropriately to threats of weapons of mass destruction until it is too late.
The only way to deal with this issue is to prove that we do have the requisite political will, via action.
Would you propose proving this via a war with a nuclear power? I submit that Iraq is a far safer choice, and just as effective (in fact, more effective, because there's less that can go wrong).