The fugitive Snowden, Time's runner-up behind the pope for its person of the year, told the magazine he chose to defy his obligations when he learned the scope of surveillance programs conducted without being disclosed.
"What we recoil most strongly against is not that such surveillance can theoretically occur, but that it was done without a majority of society even being aware it was possible," he told Time in an email interview.
Snowden, who is living in Russia under temporary asylum, has given few interviews since leaking a trove of secret documents from the National Security Agency.
"The NSA is surely not the (East German) Stasi, but we should always remember that the danger to societies from security services is not that they will spontaneously decide to embrace mustache twirling and jackboots to bear us bodily into dark places, but that the slowly shifting foundation of policy will make it such that mustaches and jackboots are discovered to prove an operational advantage toward a necessary purpose," he told Time.
He told the magazine that he hopes his disclosures will help bring about changes by forcing a rethinking by the public, the technology community, the US courts, Congress and the executive branch.