No, I know that Iraq had nothing to do with the terrorism of 9/11. I do know that terrorists had everything to do with the terrorism of 9/11. And Iraq was a known training ground and safe haven for terrorists for decades. And while that should have been enough of a reason to go into Iraq it's not THE reason.

Iraq and Saddam failed to meet UN deadlines for inspection. These were conditions set from the first time we busted his ass up in '91. It's the reason he stayed in power. We let him stay on condition he does what the UN tells him and when the UN tells him to do it. UN said no fly zone, and UN said random inspections. He later says "no inspections, get out UN!" Then the UN was supposed to follow through with military reprecutions. We stepped forward to pull our end of the bargain, as a major player in the UN, but most other countries wussed out. Leaving us with the bag. (turns out France and Russia had backdoor oil deals with Saddam.)

That's why we are in Iraq. Not just because WMD's. We went in because, we said we would if he didn't comply. All he had to do was comply so we could check to see if he really did or did not have WMDs that intelligence from several countries reported (not just the U.S.). He and his huge ego didnt comply so we busted up his ass.
If you say it, you better do it. If you don't, then future Saddam's won't take you seriously. And, that's why we are in Iraq.