True. But I do think better planning and reconstruction efforts would have prevented the war zone. General Shinseki requested three times the number of troops that were deployed. They simply did not have enough to take an old Baghdad or much of Iraq.
That combined with turning away the local current military leadership that was volunteering to help, made it spiral way worse that it needed to.
They created a civil war where the only thing that nearly everyone agreed with was that the Americans should leave.