Because they spawn outfits who ram airplanes into skyscrapers. I see no logic in this, but some "expert geopolitical strategists" do. Same with Israel, sinks USS Liberty, and then people on the hill go orgasmic, because "higher meaning" — whatever that means.
A simpler explanation which seems to be much more believable: great amounts of money spent by them to keep the whole US political establishment wined, dined, well moneyed, and happy.