Many didn't relocate for that reason, IMO. Some relocated for a chance at a better life, of course, but not a good portion of them. They have been ordered to make personal jihad, and they will, either individually or in small groups/cells. Look at all the young, strong men (not forgetting the women and many of the youngsters). They have no intention of acclimating to our way of life. They intend to drown us in theirs.

There's another thread on this matter that got pinned.