From what I know about posts circulated in WeChat timeline, I would bet that most Chinese have already been brainwashed that national security should be defended at all cost and that Edward Snowden is a traitor whose action indirectly benefited motherland China, and therefore he should be applauded but not be learned from. Think the Nineteen Eighty-Four.
That's true, and their argument is valid, assuming they really are okay with trading off some potential increase in short term security with a rather certain long term oppression.