A discussion of the leaker is a discussion that is not entirely focused on the meaning of what they leaked.
A discussion of the leaker is a discussion that is not entirely focused on the meaning of what they leaked.
Once separately verified the discrediting game is utter nonsense though.
Furthermore to assume that studying someone's character as part of investigation (both public and NSA-internal) is just mere propaganda and media smoke and mirrors seems to dismiss more mundane notions as a) curiosity about the leaker and the story, b) routine counter-intel procedure, and c) journalists having stuff to write about.
In short, you are giving far too much credit to the idea that the public is stupid and easily distracted. Come on, we all know the score here.
If Snowden were a character if ill-repute or questionable morality (outside the question of the morality of leaking intelligence secrets to foreign countries), it requires that you question whether any of the leaked information may have been tampered with.
Once the relevant leaked-upon agency admits to the validity of information, then definitely the messenger's credibility becomes decoupled from the truthiness of the message.