[mLuby]

There is a technological solution: plausible deniability. Devices/apps need two passwords: one unlocks your normal and secret files, and the other only unlocks your normal files. Agents asking for your passwords would see evidence of normal use only. Sort of a "can't prove a negative" defense.

The problem is that HN-types want to assert cryptographic power over agents of governments, ie I won't show you my files and you can't make me so I win.