France has a huge body of dis-enfranchised easily radicalized youths. This has already led to many confrontations with the rest of the French and has resulted in riots, bombings and shootings. It's a real problem because for a long time politicians were somewhat in denial that this could become a problem and now that it has emerged it is very hard to change things for the better because of the numbers of people involved. This is complex stuff and there are no easy solutions, if any.