A short BBC commentary by Professor Fawaz A Gerges:Link:http://www.bbc.co.uk/news/world-middle-east-29123528Since the sudden appearance of the extremist Sunni Islamic State (IS), the group has seized headlines with a shocking level of blood-letting and cruelty - but can its savagery be explained...
Here's a taster:It is a conscious decision to terrorise enemies and impress and co-opt new recruits. IS adheres to a doctrine of total war without limits and constraints....
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