What happens when something you know to be true, that you believe deeply in, that you have incorporated into your mental model of the world and based other decisions on, turns out to be false? How do you shake the very foundations of your opinions and strategies and remake your philosophy when you find out you were wrong?
Some (not all) of the people I know are up to it; they're bright and committed to the truth. I wonder whether they'll accept the truth.
Bush didn't lie. According to the Rockefeller committee report, there was substantiating information and/or evidence supporting the president's statements:
On Iraq's nuclear weapons program? The president's statements "were generally substantiated by intelligence community estimates."
On biological weapons, production capability and those infamous mobile laboratories? The president's statements "were substantiated by intelligence information."
On chemical weapons, then? "Substantiated by intelligence information."
On weapons of mass destruction overall (a separate section of the intelligence committee report)? "Generally substantiated by intelligence information." Delivery vehicles such as ballistic missiles? "Generally substantiated by available intelligence." Unmanned aerial vehicles that could be used to deliver WMDs? "Generally substantiated by intelligence information."
Presentations by elected Democratic officials implying the contrary conclusion are just politics as usual.