What sort of person wants to committ such a murderous act? If it's one where they also die then you can discount psychopaths and you are left with emotional humans who have listened to the wrong people and been shown how to prepare. Can we provide a more persuasive positive message? Can we look at more for those most vulnerable?

There was a post on Facebook today saying Isis follow an Islamic ideology which is promoted by the Saudi government. If this is true then is a western world wanting such close relations with Saudi Arabia really the best idea?