Because the CIA sent Snowden to the NSA to undermine them. Mission accomplished.  NSA seems to have been the one uncorrupted obstacle they hadn't gained control of.  Insert Snowden. Catastrophic leak ensues.  Remove Rogers.  Appoint a Deep State figure to head the agency. Systematically remove Patriots in the NSA.  America now completely under Deep State control. Nothing like the rise of Trump could ever occur then.