Without getting into semantics over what constitutes a civil war, the US military did prevent Iraq from being taken over by the radical Islamists during the worst of the Insurgency, something which wouldn't have happened in a civil war following post-Saddam crisis without the invasion. Again, that's no way to justify a war by using hypotheticals, but if Iraq were going to have a civil war better it certainly is better for the region and Iraq's future for it to be done with America involved, keeping the worst from winning.
"and leave... great game America lol"
You'd rather America stay?
Iraq and al Qaeda were linked. By very little. No one says no proof, but very little. And it turns out there wasn't a serious WMD program. That was a mistake unparalleled in our nation's history. But it was an honest mistake. An honest, terrible mistake.
Like I said before, and you would have noticed if you weren't busy puking talking points, Iraq is better today than it was before because Saddam was removed and democracy is at least a serious possibility. That doesn't mean it was the best choice for America, but Iraq will benefit from it in the long run. Benefit in the sort of way that India got English and railroads from British involvement.
So don't assume the US invasion was the worst thing that could have happened. Imagine a broken Iraq that got rid of Saddam itself with no US army to try to keep order and keep Iran out. Imagine Uday or Qusay ruling just as ruthlessly. It's easy to be against the war, it's a lot hard to really thing about it and realize the nuances.