To look for the "root cause" of Isis is to miss the point. The group represents all the subterranean barbarism that every so often is apt to crawl, blinking into the light, out from the depths of the human subconscious.
Certainly an interesting POV and a reminder that ISIS is not new, nor just an extreme form of Islam IMHO:http://www.independent.co.uk/voices/...h-9664506.html