Every story has to begin somewhere and that is the neocon trick. You take a situation that you have framed from your own perspective and then use it as a starting point for developing additional arguments that favor the action you wanted to take in the first place. In the case of a country like Iran, you claim that the Iranians must be checked because (a) they are destabilizing the region (b) building a Shi’ite land bridge to the Mediterranean (c) supporting terrorism (d) secretly constructing a nuclear weapon and (e) developing ballistic missiles that will enable them to deliver the nuclear weapons. By establishing your premise of Iranian threat as the basis for the discussion, you completely avoid having to demonstrate that Iran is actually doing any of those things, which is a good thing because every single point is either palpably false or can be easily challenged.