Facebook isn't the best example of anything really. There's plenty of services that encrypt messages end-to-end without the ability to "unlock" the message by the service itself. What I don't understand is the argument or case being made that giving anyone the ability to break encryption is a good thing. Smells to me more like ulterior motive to just get the backdoors put in. This isn't actually going to protect anyone any better. Governments have already long had tools to subvert things in various ways regardless of the need to actually break encryption. Why are we arguing for a larger surveillance state?