All for naught if the "terrorists" really want to make a statement. Remember, this enemy in particular is pleased a punch to die in the cause. You could have 100,000 guards (and they probably do, just ain't fessing up to it), and yet another Mumbai could happen easily with enough BGs willing to die just to mess up Satan's games and sow terror.
This is the wrong approach in so many ways, but like in the original Tinker Tailor Soldier Spy BBC movie, the line "Bloody awful cabaret" comes to mind.