And, that's just in Syria! These brave men and women hiding behind their masks are more than ready to pick up the sword to continue the barbarism of the ISIS animals. And their practices are not new.
The ISIS behaviors that we find so shocking were widely practiced in even the most civilized parts of the Muslim world around the time that the Statue of Liberty was being dedicated in New York City.
This article @ Understanding the Caliphate Curve goes on to confirm that erasing this filth from this earth is a far bigger task than most are willing to discuss. Political Correctness?