The only thing I'll add to this discussion is that we're treading ground where a federal republic can begin to trip itself up: when it decides to take action upon the population without telling the population. When that happens we don't know what we're voting for. We cannot trust lawmakers because we don't know what they're doing behind closed doors. I understand that certain things need to be classified. I'm not so naïve as to suggest there should be no government secrets. But there is a line that is crossed when certain basic liberties the general population believes it enjoys are infringed upon without their knowledge or consent. Many here are much more knowledgeable than me on this topic, but from what I've come to understand, not only has the NSA (along with other government agencies) collected data that most people would assume is off limits, some within the NSA have also taken it upon themselves to go above and beyond what is permitted to them by the FISA courts, etc. When secretive actions surpass their secretive systems of checks and balances, I think that is cause for concern. I am not justifying Snowden's actions, but in a topic so polarizing, it's easy to miss the other side of the argument.
I think Snowden has crossed the line, especially with some of his more recent leaks. If he had left it to simply showing the American population that they're surveilled quite a bit in ways that might surprise them, in ways that seem to bypass basic protections afforded by the Constitution, I think I'd be closer to jes' side of the argument. What continues to leak out though is increasingly damaging, and it's incredibly unfortunate that Snowden has decided to take it this far.