I don't know how many hours of analysis of the whole Iraq thing I listened to on various NPR programs, as well as interviews with Bush-administration defectors.
Still seems to me that the underlying motivation was the so-called "Neo-Con agenda" with the "taking down a dangerous dictator" as the pretext. (and of course, the conflation of that dictator with 9/11)
That was the notion that Iraq was ready and waiting to be freed of Saddam, and since they were essentially a "secular" country, there would be a brief spate of dancing in the streets...Followed by the rapid formation of a nice, US-friendly democracy which would be a shining example of same to the whole region. (and presumably, over years, that democratic model would be exported to other problematic countries)
That sounds great..... Alas that no one paid any attention whatever to the warnings from people who did in fact know better. I recall listening to an interview with Madelaine Albright pre-invasion. She rather neatly ticked off the problems that we would encounter.
Iraq was only "secular" in that Saddam had suppressed the warring religious factions, much as the Soviets had suppressed the factions in the Balkans.
Iraq had no sense of nationality; it was an artificially-constructed nation incorporating a number of different religious and tribal powers that all hated each other.
It's not that this information was not available; it was merely ignored, or in some cases shouted down. Same with the "intelligence". The administration was warned that some of their "sources" were self-serving individuals with an eye on taking power in a post-Saddam Iraq.... Again, largely ignored.
A great deal is now being accepted under the general category of "faulty intelligence", but from all the stuff I listened to it was much more...."We are going to war, find us some excuses."
I seem to recall that Bush made war-intention statements shortly after being elected.