There were terrorist bombings in Bagdad (the capital of Iraq) the month before Obama was inaugurated. Death an injuries continued to decrease during his first 4 years. He should have gotten us out, just like he should have gotten us out of Afghanistan, but didn't. I suspect that even a democrat thinks war is good business, just like Republicans, sometimes. The Iraqis, this last December:
In attempt to ease pressure, Iraq announces end to U.S. ‘combat’ mission
Now they just want our money. With American deaths for those people being 11 or 12, the last couple of years, I have seen that many in a state wide annual training cycle of the National Guard, so some would say the high dollar costs we are paying are worth it and I suspect you are correct that Iran would probably take them over in less than three months if we did leave, and it leaves us a footprint in the region, which I think was the actual goal of Son-of-a-Bush in the first place, but it was an awful expensive place in blood and treasure, just to have a footprint in the sand, and wasn't worth it.