Parallel or opposite?
UK Telegraph notes that several hundred Englishmen, who have converted to Islam, are fighting on the rebel side in Syria. 'Experts' are worried that the jihadists will return to pursue jihad in England.
Something like this happened before, with the opposite result. Hundreds of Englishmen, who had converted to Communism, fought on the rebel side in Spain in 1939. Most of them returned disillusioned, not newly committed to pursuing Communism.
If these jihadists return with a new commitment, it will prove two things: (1) England is too fucking stupid to control its borders, which we already know. (2) Islam is a better ideology for Westerners than Communism.