Trust is a two-way thing. Citizens must trust their government to represent them in the best possible way, and the government must trust the citizens to accept their decisions or, alternatively, choose a different government. The crucial point is this: a government that does not trust its own citizens should not be serving in a democracy.
The most important thing about NSA electronic surveillance is not that it exists, but that its existence was denied for so long. There can be no doubt that Edward Snowden broke the law, and should be prosecuted (it does not mean he must be convicted). What's really distressing is that society needed him to speak up because the people we trusted to tell us these things have not trusted us with the information.