Please. The invasion of Iraq was the culmination of an intense propaganda campaign directed from the Bush White House & the Defense Dept. Their exploitation of 9/11 for that purpose was masterful & ruthless, completely unprincipled, utterly fraudulent.
Whatever their reasons, the intelligence reports were selected from thousands to serve their purposes. Old intelligence reports were, uhh, "re-evaluated" with that goal in mind.
GWB said "find me a way" & his minions did so. Intelligence reports & so forth were merely selected & used to justify pre-existing desire.
America was both bullied & chumped into going to war by the bushistas. Some of us realized it at the time, some later, and some obviously never will being unable to admit they were chumped. Staying chumped about that & a lot of other stuff defines the Repub base.