"incriminating". You don't want to use that word. Because if you're actually doing something illegal or immoral, that is not a compelling reason for us not to act on it.
The idea that you need to be able to hide your political speech is a problem to start with. You won't be saved from tyranny by that power - if you use it, you already experience it and tyranny needs no reason to kick in doors beyond suspicion. Accurate intelligence is what you need when you're trying to do things right (or you've executed all the dissidents and the remaining ones are still a real threat).
Those who want to hide don't interest me. If there fears come to pass, I'll be long dead, and they'll have sat by and done nothing while it happened.
Of course you need to be able to hide your political speech; people automatically temper their opinions to conform more with the group or choose to remain silent in situations where everyone's political speech is visible. Without the ability to keep cloistered political speech as a realm to discuss and test ideas without condemnation, the political speech landscape begins to look horrifically uniform and (inevitably, because they control the media) pro-state. To reiterate, if the state has the ability to spy and understand 100% of online political speech, people will self-censor their speech, preventing different ideas from propagating.
This is currently the case-- radical political ideas have been accompanied by state surveillance and attempts at discrediting for a long time, and the current crop of NSA totalitarianism is no different.
The idea that you need to be able to hide your political speech is a problem to start with. You won't be saved from tyranny by that power - if you use it, you already experience it and tyranny needs no reason to kick in doors beyond suspicion. Accurate intelligence is what you need when you're trying to do things right (or you've executed all the dissidents and the remaining ones are still a real threat).
Those who want to hide don't interest me. If there fears come to pass, I'll be long dead, and they'll have sat by and done nothing while it happened.