This. There is a difference between immigration and diaspora. Immigrants are typically very open minded members of their society - they are looking for new opportunities because their own society at home is holding them back.
What we have in Europe right now is a diaspora - people from a totally foreign culture forced to live with another. Of course, one can argue that the refugees are in Europe by their own will, but the economic and social hardships in their own countries is so bad, that I would consider this a diaspora.
The political correctness of the hosts will allow the new foreign culture not to assimilate, and the children of these foreigners will end up outsiders in their own country. At least when there was conscription army in Europe, young males were forcefully mingled with other members of the society. Nowadays, young males are left isolated, exploited and desperate in their own ghettos, ripe for extremist brainwashing centered around their foreign culture and ethnicity.