Hindsight...

Move forward. I dont think the Dixie Chicks knew that 400,000 troops making sure the infrastructure of Iraq was taken care of would do the trick. In hindsight it was the appropriate action if we were totally committed to removing all WMD's AND securing the country. And WE voted to move in.

But WE could not tolerate that type of commitment. Another lesson learned could very well be: IF YOU WANT TO GET A JOB DONE, DONT DO IT HALF-AS SED. Some say it was a mistake in the first place, others say we did the job half way. Colin Powell thinks it was correct to go in, but we did not send nearly enough troops... So anything goes looking back.
France did not look very smart after WWI, WWII, Vietnam... so their history allows them to tell us we told you so? Does not make the country that gave us Napolean correct either.