Why is the Islamic State group so violent? BBC News

Filming of people beheaded, drowned or burned alive in Syria and Iraq; The bombing of a Russian passenger plane in Egypt; Mass killings involving Christians in Libya and concerts in France: Why do Islamic State militants commit such acts of brutality? Charlie Winter, an expert on jihadist militancy, assesses the ideology of the group and suggests that grotesque acts of violence play a part in his broad strategy. Video produced by Marcus Thompson (originally published on 8/8/2015) Subscribe HERE to BBC News
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