Soldato
Bull.
Tell that the the people who survived a terrorist act on board an aircraft or the families of the dead.
To those who think there are outweighing reasons against, you're an idiot.
Imagine if there was an instance it saved a plane full of people, instantly the system has just become the best thing that has ever happened to those lives saved.
Not saying if it wasn't in place a person trying to do something wouldn't be caught.