I had an interesting discussion with my friend Aidan Hartley earlier this week about whether the young men fighting for the so-called Islamic State are psychopaths. (This was before the news broke of Steven Sotloff’s beheading.) Aidan is better placed than most to answer this question, having worked as a war correspondent for many years and written a classic book on the subject called The Zanzibar Chest.
His view is that the Islamic radicals attracted to IS are not run-of-the-mill jihadis, but a particularly nasty sub-species. Without in any way trying to defend the activities of terrorist groups like al-Shabaab, whose handiwork he’s witnessed close up, he thinks of them as being more like the IRA. That is, their adherents are motivated by a toxic cocktail of political and religious ideology which sanctions the murder of civilians as a means to an end.
The members of IS, by contrast, aren’t ideological fanatics so much as bloodthirsty monsters.

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