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@village_person wrote:

I am sure there is a verse in his holy book which allows for this sort of behaviour. I see no problem with the execution.

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There are plenty of things in the bible that allow all sort of atrocities. 

As a very wise person recently said:  "It is not Christians against Muslims, but all decent people against all radicalised fanatics"  and sooner we all realise that, sooner we will be able to disable ISIS.  Their most efficient recruiting tool for ISIS are the people who keep demonising all Muslims.