Yes, I do see that it is a rather sick story.
However, while it is almost universaly agreed upon now that entering such a war in Iraq is considered an act that was "stupid," (as well as countless other words I will spare you from) it would be an even greater mistake to immediately pull out.
Yes, looking directly at the issue, removing a slightly irrational dicator from power is a good thing to do. Unfortunately, looking just at that is extremely short-sighted, and not realizing that every action on such a scale has a serious effect on the rest of the world surrounding it.
In this case, we're seeing it clearly now, in the form of the insurgency. Make no mistake, these insurgents were not active in Iraq while Saddam Hussein was in power. I am not being one to judge which is worse than the other, but it should be duly noted that we (referring to Iraq, the US, and all other countries involved) have traded one problem for another, that is still significant.
It would be sheer folly to leave without ensuring that all of these problems won't become deadly to the Iraqi state. Perhaps the most unfortunate aspect of the restructuring program to democratize Iraq was that we saw the elimination of ALL of the government structure that was there under Saddam Hussein. Hence, Iraq has returned to a complete "infancy" state. Without a LOT of growth, the state will not be able to stand on its own. The fact that it's a state that must hold three nations (Shia, Sunni, and Kurdish) together doesn't help either.
As it currently stands, Iraq is poised at the edge here. A fall will mean a civil war, and by most possible outcomes, a major war that would stretch outside of the Middle East. I think we could all agree that this is an outcome that should be avoided at virtually all costs. Thankfuly, at least, we're getting there; the new government seems to actually hold legitimacy, (the fact that the three abovementioned nations are now accurately represented in the legislature) and actually developing into a stable state are in sight. With any luck, such a state would actually manage to remain democratic as well.
Wake up, George Lucas... The Matrix has you...