It really depends on what you're doing. The NSA doing something like breaking GPG/PGP encryption would be like breaking the Enigma during WW2. You don't want to

It really depends on what you're doing. The NSA doing something like breaking GPG/PGP encryption would be like breaking the Enigma during WW2. You don't want to tip your hand to your opponents that you can read their communications. IIRC, the Allies sometimes had to not act on information that could save lives because those actions would reveal how much they knew to the Axis powers. So basically you only end up acting on really valuable information.