I understand the line "By the nature of what they do, their successes are never clear." but I would think that will all of the bad "publicity" the NSA is receiving they would at least pull one example out where they prevented an attack. They have only release vague numbers on the number of incidents prevented and when put under a microscope they weren't a very big part of the plots they claimed to have foiled. I understand the "international disadvantage" but I don't think we can allow everything the NSA does with "Everyone else is doing it" defence.