You can't let Iraq fall into the hands of another dictatorial regime, which make no mistake, that's what ISIS wants, an islamic dictatorship (they would call it a caliphate and helpful idiots would say it's an "islamic republic" whatever that is... but it's a dictatorship under sharia). Because how long until you have to go in again and fight a stronger force? No, hit them while they're not completely in control and organized.
Btw, if the USA won't go in, Iran will. Iran will pledge support to the shiite government of Iraq and go in and defeat the sunni forces of ISIS... and maybe they won't stop at Iraq, what if they go in Syria under the pretense to "finish off" ISIS? Finish off the terorrists? Who can say that they're wrong? Nobody.
So congrats, you just gave Iran at least 2 puppet states.
I am all for America being for non-interventionism, but if you went in to do a job in Iraq, end the job. Don't leave it half-assed. Don't just pack your **** and leave. You went in, you overthrew a dictator which for better or worse kept the peace in that territory.
Islamic rebels wouldn't have happened under Saddam because he was a brutal dictator.
The only reason they happened in Syria under Assad is because for 30 years, ever since the Iran-Iraq war and especially after the first gulf war and the 2nd gulf war, sunni muslims, including former military soldiers, have left Iraq to seek refuge in Syria. And when they were strong enough, they rebelled and are now causing problems in Syria. And now, those same people and their new recruits are coming home to roost in Iraq. They're coming back to their country as militant islamists. So don't make it sound like the USA can just pack **** up and leave. No, you ****ed up. Take responsibility and clean up the mess or accept that yet again, you went in, put your dick in the pond, stirred the fishes and left.