Considering the alternative was to essentially ignore or even capitulate to al Qaeda without even a fight, essentially surrendering even worse than Vichy France, yes, it was WELL worth it. And don’t think of it as a theory. Bill Clinton had REPEATEDLY done exactly that for eight whole years, no less than 10 times.
Well that was not the only alternative and nobody was talking about surrender to Al Qaeda. Plus it had zero to with WMDs in Iraq. If you remember, the imminent threat of WMDs was the fable W sold to the frightened American Public in 2002/2003. There was no formidable ISIS/ Al Qaeda presence in Iraq until after the invasion.
This will be one area in which conservatives will always disagree. Back in the day, I resented being called an 'appeaser" or "RINO" on these very boards just because I opposed the party line. The insults were so intense, I kept away for almost 5 years. But those days are in the past and we need to move on. In 2020 there are upcoming events that may put our republic at stake. In around 100 days we have a critical election that the Dems can't be allowed to win. I am talking on Federal, State and even Local levels. They should be the focus of our opposition and efforts. It shouldn't be fellow conservatives with whom we disagreed with on an issue 16 years ago.