Mark Steyn has been hammering on the subject of demography for a while now, ploughing a fairly lonely furrow it has to be said. The essential thesis is that the catastrophically low birth rates in the developed West (1.2 in Italy, 1.5 in Spain) coupled with the very much higher birth rates among Muslims in particular (3.5 in Europe, 7 and above in some places) is leading to the end of the Christian West - the flag of Islam will fly over Downing Street, it's only a matter of when.
Without going too deeply into the rights and wrongs of this, is it perhaps extending this analysis to another area of world politics Mark is interested in - the war on terror? Because it's a pretty unarguable fact that the group most susceptible to violence and stupidity is young men. Muslim countries have about the highest proportion of young men in the world at the moment (I believe the average age in Iran now is under 25). Is it not therefore entirely natural that the countries most prone to violence should be those with an unusually large proportion of young men? Compare Japan's demographic profile today with the 1930s. Anyway, it's a possibility.