I'm Canadian so I won't get involved in the argument, but one thing sticks out in my mind.
Before they went to Iraq to look for 'weapons of mass destruction', there was a news broadcast that showed a video of Sadam Hussien commenting on Bush's views to his staff. He basically shrugged his shoulders and said "they won't find any..." with a small laugh that was obvious that he meant there weren't any to find.
You could tell from Hussiens's body language that there really weren't any WMD's and that he knew Bush was trumping up charges.

When Bush started the war I knew he was lying about finding WMD's and that the whole thing was a scam for some alterior motive.
Far as I'm concerned, it was Bush jr. finishing off what his father did 10 years earlier. It had nothing to do with 9/11 or WMD's and had everything to do with occupying another country for oil or whatever else they wanted just to get even for his dad.

Just my opinion, but Bush's whole motive is world domination for the U.S.