ISIL exists, almost entirely, because of our 'morals.' We left the Middle East never to return, without finishing the job. We left behind a government too weak to hold them off, and refused to support the (legitimate) Syrian revolution for long enough that they were forced to turn to IS. Syria became their call to arms, and they carried it right back into Iraq and murdered thousands of people, and nobody noticed until they started murdering white people, because, you know, we're moral.

The answer has always been the same. Go over there and do bad things to bad people, until the good people have enough breathing room to handle it themselves. But we can't stomach that, nor do we want to. So, get ready for Paris to happen again every 3-5 years (to us, it happens every couple months in the Middle East). Hooray, morality.