This type of thinking is the exact problem that I'm highlighting. I respect Schneier and have read his stuff for a long time, and even gone to see him speak, but believing him over the FBI is just an appeal to authority when he is just another outsider without having access to any first-hand knowledge of what evidence the FBI possesses.
Also now after Snowden everything the USG does is to be doubted (I'm guessing since his revelations affect the internet and this is the first issue that has directly affected people on HN), and now everything they do can somehow be traced back to trying to suppress, hamper, weaken and spy on you via internet.
Watching the theories that somehow we'd try to use N Korea who have zero value economic value to the USA, or actually posing a threat as some kind of scapegoat to hinder online speech is more entertaining than anything else.