The war was about 4 things..
1) Oil - I don't understand how people see this as 'bad'. Those same people screaming about how 'we don't need your oil war' are the same that piss and moan about gas prices being over $2/gal. Protecting or developing our oil interests makes our economy better. I just wish the administration would have said so up front.
2) Presense - I believe in some part the war in Iraq intended to put the world on notice after 9/11. It basically said 'We're not going to take shit from anyone.' and in no small part was telling 'Lil Kim' in North Korea to sit the fuck down and shut up or you're next.
3) Retaliation - I DO believe Bush wanted to kick down Saddam's door after he plotted to kill George H. Certainly not the right reason considering his position as leader of the strongest free world nation, even if I do understand it a bit. It's carved into his being.. 'You mess with my family.. you mess with me.'
4) WMD's and BMF's - I DO believe Saddam had some forms of WMD's prior to the war. There is also very credible evidence that he was trying to buy black market nukes. Regardless of all this, Saddam and Sons, Inc. was a nice little collective of Bad Mother Fuckers. They needed to go for no other reason than this actually.
As for the rest of the world.. I'm SO sick of hearing how 'The US is not the world's police force' and yet those same people will shake their fists, raise banners, and protest us NOT going in and policing some other area. You can't have it both ways. Were it me.. I'd tell the rest of the world not aligned with us to go piss up a rope. France wants to thump their chest and play 'concerned neutral power' while they backdoor military supplies to Iraq? Fine.. no problem.. just next time Da Fatherland comes knocking on your door.. learn to speak German, cause I we won't be there to bail you out again.
I would pull US forces out of every foreign nation and basically put the world on notice that if you screw with the USA, we'll turn you into a glass parking lot. Quickly, decisively, and with extreme prejudice.