Devil's Advocate — in the entire history of US law, if police can convince a judge that they have a good enough reason, judge can give the cops permission to break into your house, your bedroom, your diary, your safety deposit box, the safe you buried in your shed ... a judge always had the choice to decide whether or not cops get to invade your privacy.

For the first time, ever, strong encryption changes that paradigm. Personally, I'm still in favor of it, but it really is a very fundamental game-changer.