We need to get our semantics straightened out. Pakistani's are NOT Arabs. Now if you are talking about Moslems or Islamics that would make more sense.
We are NOT looking for Arab terrorists, we are looking for Islamic Radical Fundamental terrorists. They come in many variations including some American-Islamic Radical Fundamentalists, USA citizens. In fact, one on our FBI most wanted is a US citizen. His parents are from Iraq - they were in this country when he was born.
Now here's another reason to not allow citizenship to children of parents who are NOT citizens. Do you agree???
Pakistaniis are not Arabs. Not even their neighbors to the west, the Iranians, are Arabs, You've got to go clear to Iraq or Saudi Arabia, or one of the minor Persian Gulf states, to find Arabs. Other than the "afghan Arabs" of Bin Laden's organization that is.