I think my post 18 is more plausible.
You make a good case. Also we are using France, Germany and Russia in our efforts to keep Iran from the bomb. So the WMD issue is being put on the back burner for now. It wouldn't make much difference if we discovered everything. It would be buried on page 63 of the NYT anyway. Let's just bide our time. The truth will come out one of these days anyway.