Shock value for media attention.
They line up and kill hundreds in a row and get little coverage in the west. They behead a journalist and the western media finally takes notice.
ISIS is outta control. I didn't support the Iraq war, but I fully support a war with these sick fukks.
How the brutalized become brutal. - Chris Hedges
http://www.truthdig.com/report/item/how_the_brutalized_become_brutal_20140824