It isn't, I can assure you. I come from an immigrant family in the Netherlands and I have a plenty of Arab and African friends. We are integrating slower than the Europeans did in America thats just it. There are a lot kids that don't know how to speak their mother tongue, that don't go to the mosque or even hang out with their ''own'' kind. In a few generations they will be part of European society. An example, I speak fluent Turkish, but my younger brother doesn't and there is only a difference of 4 years between us.