It's not that past conversations should be immune, it's that the act of surveillance shouldn't be allowed until there's a good reason to have it.
The letters analogy is an interesting one though, if I leave permanent records of what I'm saying that are accessible then yeah I guess, but when I use encryption it's like I'm burning the letter after I read it; the intent is to keep the contents of the letter private. I should be able to do that if I want in a digital age shouldn't I like I could in the era of paper letters?
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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