But here you say that: Security can depend on social contract and not technology. But the same argument can be applied to your original objection. We can mandate (in the social contract) that people have the right to privacy. (And there are some analogs where we do that, for example, we could have Gattaca-like dystopia where people's access to health care is based on genetics, yet all developed countries have a ban on such discrimination.)
I think it's far more dangerous that the government or adversary is technologically capable of being non-transparent than if ordinary people don't have capability to be non-transparent. It's because I believe power ultimately thrives on information asymetry, and the encryption only amplifies this asymetry.
Quite the opposite, I find. In fact, the government has the infrastructure and political power necessary for surveillance of people. The reverse is definitely not true. Regardless, assume you are in an authoritarian state with a powerful state police: how would you even attempt fighting it if you do not have a way of coordinating with the other people being oppressed? How can you trust communications if the government can interfere?
I think privacy is important in democracy, but if you're taking on an authoritarian state, that some police knows what you had yesterday for dinner, that's the least of your problems.
To clarify: The harsh truth is, in an authoritarian state, the police doesn't really need your communications; they already know what you're up to: no good. That's enough for some of them to justify any action they want against you.
> Security can depend on social contract and not technology.
Social contracts are technology, laws are technology, law as a concept is technology, Society is technology.