When the political class discusses defeating ISIS, they do so misleadingly.  Although defeating ISIS is necessary, it is not nearly sufficient to end the threat of radical Islam:

“Iraq is but one front in a broader war against Salafist extremists dedicated to eliminating Western influence from the Islamic world; winning the struggle may take decades.  There is a growing realization that the most likely conflicts of the next fifty years will be irregular warfare in an ‘Arc of Instability’ that encompasses much of the greater Middle East and parts of Africa and Central and South Asia. . . . Final victory in today’s fight depends upon the integration of the nations in the Arc of Instability into the globalized world’s economic and political system.”

-Lt. Col. John A. Nagl in Learning to Eat Soup with a Knife