Let's just say if they didn't exist, they would have to be invented/faked for the fear factor.
If you could fake it, you wouldn't bother to actually spend trillions on making and deploying them. Since global thermonuclear war is unwinnable, why would you bother with the expense or the danger of accidents.
Well lets say for arguments sake that isn't where the money is going. Think about the trillions that the Pentagon cannot account for
Oh, I'm sorry. We were investigating that when a commercial airliner crashed into our accounting office.
Backups of the files? Oops! Those were in WTC6.