If there is one thing that we should all be taking away from the Snowden episode, it is the fact that all human activities are utterly arbitrary. We decide to live in a free society, and then we do the things necessary to live in that society as we have defined it should be.
The definition keeps changing. One minute, its just not a free society unless you can keep slaves, the next minute its not a free society unless women vote, the next .. well, you get the point. Society is only as good as it declares its intentions and then carries them out; nowhere, alas, in the entire miasma of American law, is there the requirement that one has to always try their best to do well, and to operate on the principle of the greater good - in face of all opposition.
This too, is arbitrary, and the point where it becomes reality instead, is when an individual voice in the crowd stands up and says "this is how things should be!", gaining a little more volume than everyone else, and getting a bit more agreement, in the face of all the worlds cannibalism, that it might be good to cook things slightly differently.
Snowden, and others out there working in their own, utterly non-arbitrary ways, are always going to be necessary to remind us that just when you think you are safe, because status quo, the new safe realm is the as-yet completely unexplored ..