Since the NSA will never admit they violated the constitution, no one can get discovery to prove they did, thus they will never be held to account.
The very Nature of "national security" and the ability of the government to literally make everything including the price they pay for a hammer a matter of "national security" and hide these things under the impenetrable cloak of that claim is a major damn problem.
As to the charge they have "disappeared" people, given we know 100% factually that the CIA perpetrated immoral renditions for the purposes of torturing people "legally" I fail to see why you do not believe other branches of the government did not follow the same play book
Hell they have admitted to executing US Citizens with out trial... I do not believe there is anything they will not do.