People being inconvenient in pushing for social change are insufficiently protected. The CIA spied on MLK Jr., discovered he was having affairs, and used that to try to blackmail him into committing suicide. If he had, that would have been a major loss to society.

And now we have reports of the NSA developing dossiers of minor crimes and non-crimes of inconvenient people's behaviors for future use in discrediting them.

Is your suggestion that anyone who is (or may in the future) choose to be politically inconvenient should use strong encryption for everything even slightly unpopular they may do?

We can't contain cryptography, but neither can we depend on it being universally and effectively applied.