The fall of that statue in Baghdad on that day should be the visual equivalent of the fall of the Berlin Wall for this president and his presidency. It is not. It is now a negative used by the Democratic presidential nominee.
Now, all that said, here’s a critical rest-of-the-story: George W. Bush eventually became unpopular in Iraq, as did the occupation/reconstruction, especially in the 2005-6 timeframe. No question. The situation deteriorated. But that’s a different argument. The fact is, we were indeed greeted as liberators.