Iraq is misdirected anger and aggression. It has become a rallying point for Muslim extremist around the world. Instead of taking the fight to them, we've given them a playground to create havok.
The facts are the insurgency and extremist movements are not getting weaker, they are picking up more recruits and spreading their chaos to other parts of the world (Jordan is a prime example). Essentially, we've given fuel to their fire.
If Bush was really interested in fighting terrorism we would have gone into Iran, Saudi Arabia, or Pakistan well before we went into Iraq. A bigger question has got to be how exactly are we supposed to win this war on terror? We must defeat their ideology and create an environment where it is unsafe for them to live, instead of the other way around.
The reality of this situation is that we never planned even remotely well enough. Now, we are paying the price because in a few years we will pull out of Iraq, and for all we know the people of Iraq might install a religious dictator or they may end up in civil war. The cost of poor planning could very well mean the destruction of the goals we set out to accomplish.