Afghans have been displaced and are living throughout the world. Since you are a neighbor, a large portion of them came to Pakistan. It is not by choice, but compulsion which was forced upon them to leave their homes for the safety of their children - a war that benefited Pakistan greatly and the WOT, which Pakistan was the most important ally in, in which it played (and continues to play) both sides for its own benefit.. So it isn't very nice to put the blame these Afghan refugees.. sincerely help rebuild Afghanistan and they will be more than happy to go back.