According to The Age:
"The coalition did not act in Iraq because we had discovered dramatic new evidence of Iraq's pursuit" of weapons of mass destruction, Mr Rumsfeld told the Senate Armed Services Committee. "We acted because we saw the evidence in a dramatic new light - through the prism of our experience on 9/11."
Now I approve of Borges a lot. I even approve (mildly) of Rumsfeld's burgeoning poetic career. But I think you have to treat any evidence proffered by the Pentagon or the White House carefully. It may, by their own admission, be prismatic.