The principal argument, to my knowledge, that Europe ought to take in refugees from Syria (and other war torn countries) is a moral one. The refugees are innocent victims of brutal wars, the progressives argue, and wealthy European countries have a moral imperative to accept them, house them, and meet their demands.
I have yet to hear a Realpolitik reason why Europe ought to take in refugees. Is there such a reason?
To make it absolutely and unequivocally clear what I'm asking:
How exactly is it in the interest of the peoples of Europe to accept millions of culturally dissimilar refugees from the Middle East and Africa? For the peoples of Europe, do the benefits, if there are any, outweigh the risks?
I am not asking why regulated, legal immigration in controlled quantities is in the interest of the host population. There are "realistic" arguments for this (e.g., compensating for declining birth rates, economic growth). Rather, I am referring strictly to the massive and rapid influx of asylum seekers who have came to Europe over the past two years in the so-called "refugee crisis".