https://www.schneier.com/blog/archives/2013/06/the_psycholog...
FWIW, you identified the reason(s) why I'm personally not concerned about general erosion of privacy, while bring very concerned about differential erosion of privacy.
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A though, can animals conspire? It's something that almost seems to require intelligence and "higher level" communication. Do chimpanzees conspire?
Would there be an adaptive advantage to conspiracy skepticism? Is that why conspiracy skepticism is so common? Most people are followers and a few are... tricky?... leaders?
Maybe rampant conspiracy is a phase between the moment of evolution of intelligence and the time when "fake news" forces fidelity to reality? It's trivial to show that conspiracy is only ever a local optimum. Multiple competing "truths" incur caloric cost to maintain, but honesty is maximally efficient.
Maybe we all get a clue, become scrupulously truthful, solve all our problems, and go on to live in a new Golden Age...
(FWIW, Robert Anton Wilson once pointed out that, of regime changes in the 20th century, over half of them were the result of some sort of coup. In other words, conspiracy is normal. Make of that what you will.)