This is viewed as a pretty bad development for European security and tranquility:
European countries are paying a lot more attention to the international travel activities of their Moslem citizens. That’s because a growing number of them are being drawn into the uprisings and civil wars that have shaken up the Arab world in the last two years. Some European counter-terror officials are calling it “jihad terrorism” when young (teens to thirties) Moslem men (and a few women) travel to a country suffering unrest and attempt to join one of the violent factions to fight. Often the most attractive options are Islamic radical groups, whose violent and self-righteous image has the most appeal for impressionable young Moslems in the West.
These jihad combat veterans could stoke a war inside Europe to liberate those immigrant suburbs that in the past just settled for torching cars.
European Moslems provide some recruits for a jihad against Syria's Assad that European governments don't want to fight.
Given that Europe on paper at least wants the jihad to be defeated (by someone ...), is it not possible that Christians (even just nominal Christians) might fight against the jihad even though their governments do not fight the jihadis?
And when those combat veterans against the jihad return, will they retire or continue the fight against the jihadi veterans in their homelands?
Just as Europe was a battlefield in the Cold War, Europe could again become a battlefield--but this time a hot one--in the war on terror.