While I am a big believer in libertarian-ism... is this multiple conflated issues or is this a binary thing (everyone has access or no-one does)??
1. I am totally against secret fisa court, and fishing for data on everyone's communication... whether this is by remotely accessing my smartphone, or picking off my communications over the 'public' internet. I believe is one entity has such access, every entity could.
2. Even with Tim Cook's letter, it is unclear to me if my phone's communications are secure (i.e. meta-data such as who, what, where I call) as well as the audio or text message itself.
3. I am less against data access of my PHYSICAL phone if government has a specific warrant for me and has phone physically in possession. I.E. I imagine this would be relatively few cases a year. And due to the 'sneakernet' speed of such a search it would probably be rare.
4. The problem with 3 is that it could technically be abused... say at check points like roads and airports-- and there are plenty of governments (including U.S.) that could pass such a law and then citizen's fourth amendment rights are hosed.
Anyway, Everyone who is intelligent believes Apple is right to stand up for their' customer's rights. And everyone knows when encryption is outlawed only terrorists will have it. So to summarize, Cook and Edwards are right: negotiating with them: giving an inch and they will take a mile... Or believing the child-like arguments of our 3-letter agencies (didn't they miss ISIS, the fall of the Berlin wall, WMD, etc...) . Better to fight for what is morally right now before our devices become even more sieve-like. There is a constitution for a reason, and the reason is the minority needs strong protection from the majority.