British Forces Destroy ISIS Oilfield. Why Do ISIS Still Have Oilfields?

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After joining coalition forces only a few days ago, the British Government has just confirmed that it has struck and destroyed an Islamic State held oilfield in Eastern Syria (video below).

After nearly 18 months of air strikes from American, Australia and other allied forces, supposedly to degrade and destroy ISIS, one little question needs to be asked:

Why do the Islamic State still hold and operate any oilfields in Syria or Iraq?