Morally and ethically, the NSA is still accountable to Congress. If anything really big surfaces, they'll receive all manner of unwanted attention, and if it's

Morally and ethically, the NSA is still accountable to Congress. If anything really big surfaces, they'll receive all manner of unwanted attention, and if it's big enough, no bleats about security will suffice - the committee that does oversight will be invested of quite extraordinary powers.