...The Muslims who attacked Paris last week were not (so far as we know) Syrian refugees; they were, in fact, French "citizens". In other words, the issue is one of race (and all that this word implies) and civilization, and not legality or geographic location. In turn, in the age of mass migration, the threats to a nation are just as likely to be "citizens" as foreigners or invaders.
What we are witnessing is the passing of the concept of "the citizen"—"le citoyen" that was deified during the French Revolution. The politics of the future will be based on race and identity, and not the abstract, bankrupt notions of "citizenship" currently peddled by Western nation-states.
As I have said before, the XX Century was the century of ideas, the XXI Century is the century of the blood.