That's really not true. We take away a greater part of human lifespan doing security theatre at the airport than we save. We spent TRILLIONS on wars. Had we not done so the 2008 derivatives crisis would have been smaller and more readily dealt with. instead we came within a hair's breadth of economic collapse. There are real costs in taking away from living, and taking away from our collective wealth, that are vastly greater than the direct costs of terrorism.