It's much more likely that the terrorists come from the frustrated youth born and raised in France, than some fresh immigrants.
When people like, say, Angela Merkel, advocate blindly accepting all those thousands of refuges smuggled to the EU, I just can't really understand - what's the point?
Wrong, those taxes were already used to pay the pensions in the same year they were collected. Now the shrinking work force is straining itself to pay for the increasing number of old farts, and the future is bleak.
We need young immigrants in Europe. We need them to work for us and make children for us. At least until they get rich and complacent like us and settle for 1 child per family.
There are ways to integrate them culturally, once their children are in our school system. And there are ways to avoid the chronic poverty and marginalization that plagues french banlieues. What we don't have is a way to keep paying those pensions with more and more pensioners leeching on fewer and fewer workers.