Because the government is Western, supports Israel and is a leading member of the free world.
And their deaths would be considered martyrdom and therefore acceptable to the Islamic population (so the Jihadists believe)>
bttt
..and more geographically accessible to Muslim terrorists than the U.S.
The official U.S. Govt. position on this should be: If a nuclear, chemical, or biological attack happens to an allied country or interest, then Mecca, Medina, and the capital city of every islamic country takes a hydrogen bomb. And that's merely step #1. Then see who wants to play.