The only reason we "left" Iraq is because their government didn't want to sign a Status of Forces Agreement to allow us to continue doing business as usual w/out fear of our forces being subject to Iraqi courts.
If Karzai was still in power we would've been gone from Afghanistan already. The current A-stan president is the one asking us to stay.
This bears repeating a hundred times over. Everyone jumps on Obama for pulling out or not trying hard enough to extend the SOFA. In 2008 the US said "We'll stay in Iraq if you give USF immunity from Iraqi courts." Iraq said "Nope, we won't give you immunity." An extension to the SOFA was not negotiated, our legal authorization to be there ended, and we left. If we are going to treat Iraq like a sovereign nation we have to leave when they tell us to.
Does anyone think it would be a good idea to subject USF to the jurisdiction of Iraqi courts? Because to stay longer in Iraq that is something we would have had to accept.
Also, what good would staying in Iraq have really done? The seeds of the current situation with ISIS were sown the minute we deposed Saddam Hussein's government in 2003. With the Shiites in charge the Sunnis were mistreated and marginalized. The US tried to get everyone to work together for eight years. Yet two short years after we left the Sunnis were so fed up with it that they decided it was better to support, or at least not oppose, ISIS than support their "own" government.
If we could smart bomb every ISIS fighter in existence the problems between the Sunnis and the Shiites in Iraq would still be there. This is why I get so frustrated with the argument that we need to leave "enough troops" there "until the job is done." (I'm looking at you, John McCain.) I think that is Obamacare for Republicans. We have no idea what the numbers are or how it will work but just trust us that it is absolutely important that we do it.
I'll tell you what I think some of those number are. Probably at least 100,000 troops. Ten or twenty or thirty thousand is barely enough to support and sustain those forces and conduct some dog and pony show training and some special operations stuff on the side. To have any affect on the government and culture of Iraq, which is what really needs to change, there need to be enough combat units in theater to train, partner with, and mentor the Iraq forces and political leadership. We were there almost a decade without changing anything. The length of that commitment would probably need to be at least twenty years. If not thirty or more. Long enough to try and raise up a generation into power that isn't solely committed to sectarianism and factionalism. Given the fact many of these grievances go back for centuries I'm not optimistic it could be done that quickly or that success would be guaranteed.
To make any meaningful change in Iraq that is the kind of commitment we would be looking at. Anything less than that is a waste of time, money, and lives. And if we aren't willing to commit to
that than the sooner we get out and let them decide they want to change things on their own, the better.