It boils down to this paragraph:
According to Bush officials, two factors contributed to their reluctance to discuss the Iraq-al Qaeda connection suggested by al Shifa. First, the level of proof never rose above the threshold of "highly suggestive circumstantial evidence"--indicating that on this question, Bush administration policymakers were somewhat more cautious about the public use of intelligence on the Iraq-al Qaeda connection than were their counterparts in the Clinton administration. Second, according to one Bush administration source, "there is a massive sensitivity at the Agency to bringing up this issue again because of the controversy in 1998."
Low standard of confidence, and wag-the-dog underpinnings. Radioactive.