Yeah, I'd have no problem killing these fucks by any means necessary.
Just wait until the Shi'a militias really decide its payback time and sweep north. Same shit, different day. The Kurds are the best organized and will use this opportunity to expand and consolidate their control of the north, and attempt to pick up some bargaining chips for their future conflict/negotiations with Turkey (NATO).
I know this is not a popular plan, but I think the US/NATO needs to intervene. Yes, the Iraqi's asked us to leave. I don't give a fuck, the only reason Iraq was stable prior to us breaking it was they had a relatively secular dictator in charge who knew we could kick his ass if he got out of line. The current head of state is too weak of a dictator to control the people, and not liberal enough to win them all over.
Regardless, we broke it, and if left unchecked a Sunni state in Syria/Iraq under ISIS is a giant problem for international security. It would be like Afghanistan 2.0, and we would end up fucking invading it anyway after they perpetrate 9/11 2.0. Lets skip the 9/11 2.0 part and fuck up ISIS now.
I'll say it again, fucking shit up is relatively quick and easy for the US military. When it comes to finding, fixing, and destroying an enemy, we're the fucking best in the world. We could topple most countries in a few months, to include the developed and developing ones. Yes, I'm including China in that. Its the whole hold, control, and build part that is hard. People underestimated how long it would take to rebuild Iraq and Afghanistan, not by years but by Decades. Look at the history of US involvement in other countries over the 20th Century.
Cuba - didn't stay, look what happened.
Philippines - stayed until Japan kicked us out in WWII, and then went back for a few years - somewhat stable
Germany I - left, had to go back 25 years later and fuck them up again.
Germany II - Still fucking there, larger presence through the cold war - stable US friendly democratic nation.
Japan - Still the largest military presence on the islands - stable, US friendly democratic nation
S. Korea - still fucking there - stable relatively pro US dem nation.
Vietnam - pulled out following 'victory,' - pro US government toppled a few years latter
Iraq I - did not topple government, Sadam kept it stable until we kicked his ass again.
Iraq II - about to be the same shit as Vietnam.
It takes decades to build up a country, not 7 years. We should have maintained forces in Iraq indefenatly. Fuck what the shitty president wants. We don't leave until it is conductive to US global security to do so. If we still had several brigades of combat forces in Iraq this shit would not have happened. It won't be popular with Americans who would rather spend the budget on healthcare and food stamps while they watch espn and 24hr news stations but we need to go back in and stay for a few decades.
From someone who would likely be involved for several years.
As funny as it sounds, Iran is our ally in this. Iran will be our ally again in 20 years anyway, when it is the most democratic state in the Islamic world.