Violence is prescribed all the way through the Koran. It has spread through violence in its whole history. Isis follows the Koran to the letter and should not be considered as extremists. The Koran may not teach how to make a car bomb, but, as we know, they didn't have cars when it was written. It does say how to chop off arms and legs on opposing sides, behead, pour boiling oil down throats, rape, and all sorts of other vile things. It should be pushed out of the west all together.
Islam has killed millions in the last decade, lets focus all attention on Christianity!
