We're not the ones killing the country right now. Granted, we didn't help it by boming the heck out of them and disbanding the army. But right now, the terrorists are the reason things in Iraq are so bad. Either they target us or Iraqis working with us. Regardless, it's always the innocents who suffer most, as shown in the linked article. They're the ones killing the country. If they really wanted us out, they'd stop setting car bombs all over the place. The fact that they're willing to sacrifice so many innocents in the process shows they really don't care about helping the Iraqi people, just killing us. But you see, it's a cycle: they blow people up in hopes of getting us out, but we stay there because they keep blowing things up.
As for the whole "democracizing" of Iraq, I have no problem with Iraq being a democracy, I just think the entire thing was handled poorly. We jumped in too fast, didn't really bother to think about the repercussions, and didn't prepare ourselves for a long, hard-fought occupation. And worse, we did it almost alone. I just don't think we were really prepared to keep the peace. And sadly, Bush may be too idealistic for his own good. To put it bluntly, I'm not sure the Iraq or the Middle East is really ready for democracy.