Keep in mind before they all went after Jews in Israel, the Middle East and their people were killing each other in tribal warfare and genocide historically. So there is no Borg collective among the Middle Eastern people.
If a cell wants to take out an area, those connected with the cell would probably figure they are expendable.
In the World Trade Towers many there were also Middle Eastern, so the theory of watching for disappearing Middle Eastern people isn't likely.
Always be alert. Don't have to remind you, but we need to remind others. Many Islam terrorist have been here for life.