Agreed the onus is more on the immigrant than the host to assimilate. But, these second generation kids can hardly be called immigrants. They did not chose to be born into these countries unlike their parents who made a conscious decision to emigrate there. They did learn English and French and can speak it as well as any white Englishman or Frenchman. I don't think too many of these kids have a hard time letting go off their parent's culture. On the contrary it is the lack of acceptance by host societies of second and third generation immigrants that seems to be responsible in great measure for the alienation. The only alternative for people under these circumstances is their parents culture. Refusing to let go of Islam does not seem to be the case here - certainly not the case with the British Muslims who were involved in the London bombings and the foiled plot.