The French had a major hand it in as well.It would seem flawed western policies have a long history in this particular area of the world, the drawing of national borders by the British being just one of many.
A History of the First World War in 100 Moments: A desert uprising that began in hope but was doomed to end in betrayal - History of the First World War in 100 moments - World History - The Independent
The drawing of artificial borders was done not only in the Middle East but also elsewhere and not only by Britain and France. Granted a lot of problems in the Middle East are the result of decisions taken by colonial powers - for their own national interests - without even bothering to consult to wishes of the locals but the Arabs also share a lot of responsibility for their current predicament. They have failed to unite when it really matters, are more interested in regime survival, conspiring aganst each other and being in the West's good books. And as long as various fundamental issues are not resolved, ISIS will continue to attract recruits [some of them shown in the video below]; irrespective of how much military and diplomatic efforts are put in by the West.
[nomedia]http://www.youtube.com/watch?v=AFZhQ4u2Cbg[/nomedia]