Who guards the guards
NSA is at heart a lawless agency. They believe they have every right to break any and every law so long as it is done in 'The National Interest'. They will never accept any restrictions or oversight on their operations as those could less effective than they are now. They fully believe that the only way to beat some of the worlds worst bastards like Osama or Kim Jong Il is to be just as much of a hardcase bastard.
As an American, I agree that's pretty messed up. But, I can only hope that they are not overly corrupt. For myself, I am sure they already know who I am, where I live, what I make, what I drive, and my favorite types of pr0n. My best and only real defense is to be boring. I'm neither a celebrity nor a millionaire so they really don't care what I read, what I smoke or who I sleep with so long as it's not anyone on their watch-lists. I can't stop them watching, but I can set things up to where any of them who do take an interest in me will be in their supervisor's office having to explain "You spent how many weeks and how many dollars on this guy to get nothing of substance?"
So unless one of them is so corrupt as to be willing to manufacture evidence to justify persecuting me I basically ignore them. I know they are there, I know they are breaking the law routinely, but ... Just a moment, someone at the door...