One man's terrorist is another's hero. But in a recent poll by a reputed media firm, the majority of American citizens supported Snowden against the government, with 55% calling him a whistle-blower and 34% calling him a traitor. After all US is a democracy, right?
It matters not. http://www.brainyquote.com/quotes/keywords/majority.html
He defended human rights and the Constitution that codified them, by exposing totalitarians who were violating them with impunity despite their sworn oaths to the contrary, and those totalitarians initially claimed innocent lives were saved by their violation of human rights, then just admitted that number was 0. Conversely, the totalitarians claim innocent lives were lost because they could no longer violate human rights with impunity, and that number will probably end up being 0 as well.