Now I have nothing against any country trying to make the world a better place, in fact, I can respect and support that. What happened with Iraq was a "our way or the highway" atitude that ostracized many a nation who were completely sympathetic with the US up until that point. I look back now and shake my head.
Anyway, what is done is done. I think the US should stay the course now and get the job done, which will most likely take decades (which makes me wonder what was the original timeline set up by Bush... a year or so?). Leaving now would be a bad move, and most likely undo all the good that has been done up to this point.
PS. As for Darfur and Rwanda, the world (especially the UN) certainly missed the boat on these, IMO. Nobody seemed to care... probably because they are a poor, third-world nation. I remember an interview with Clinton saying that was his biggest regret. I hope Jean Chretien feels the same way. A great book about what happened was written by Canadian peacekeeper, Romeo Dallaire if you interested in reading.
[ame=http://www.amazon.ca/exec/obidos/ASIN/0679311718/homeimprov07d-20]Shake Hands with the Devil: Amazon.ca: Romeo Dallaire: Books[/ame]