I love people who say "This war is all about oil! The US WANTS IT!" Well, we have essentially unfettered access to it. We control the fields. We haven't taken any. Why? Can't safely export it yet? I doubt that.
Look, I voted for Bush. I'll admit to that. And I supported (and continue to support) this war, NOT because of WMDs, NOT because of supposed "terrorist ties", but because the entire middle east had become a massive massive powder keg.
http://www.ggwo.org/images/map-mideast.gif
Someone point to Iraq on the map for me. See how its DEAD CENTER of the "middle east"? Iraq is the centerpiece to stabilizing the region. If we can control the center, we can control the edge. Its military tactics and planning 101 (a class I highly suggest, required for us ROTC brats)
But it also brings every enemy FROM the edge to the MIDDLE -- which for some reason, no one sems to have fucking planned for. I don't know why -- its not Bush's fault. I can tell you with 100% certainty Bush had very precious little to do with the military planning. But as POTUS and therefore CIC, it falls on him - thats how our command structure works.
Maybe they did plan for it, but never told the American Public. So now we're years into it with no end and the citizens are, "wtfbbq"ing.
Essentially instead of dropping in and assaulting a weak edge, we've parachuted into the middle and will fight wave after wave of enemy until there simply aren't any left to fight. Theres no doubt we can win this. We wouldnt have gone straight into the center if we couldn't. Our military is vastly superior and can completely handle wave after wave of enemy. It just takes time.
Iraq is the key to the region. Syria starts acting up? We've got our military about an hours flight away. They'd be squashed before they could mobilize and THEY KNOW IT. Iran? Same. Thats why they're gettin pissy NOW rather than later. As soon as we have a solid base in iraq, they know theyre toast.