I'll just take a shot into the dark and say that the 2nd generation is often the problem to begin with. You can see the same here in germany-- all these second generation turks, I know so many of them who keep talking bad about germany, how stupid germans are, what proud turks they are, etc... despite never having left germany ever in their (short) lives AT ALL. They don't even know how living in turkey is, yet they keep going with their shait.
My uneducated guess is that this happens because they either want to feel special "I'm not german (despite living here all my life)" and / or because they don't feel integrated. Also it doesn't help that a lot of these people are bad at school for various reasons, have a hard time finding good jobs, therefore mostly living on state welfare. These people seem easy to "convert" to something that makes them feel they have a purpose or whatever.