This misses possibly the most important aspect: Privacy is a shield for the powerless. In your example of reciprocal social surveillance, people had reasonably

This misses possibly the most important aspect: Privacy is a shield for the powerless. In your example of reciprocal social surveillance, people had reasonably similar amounts of social and physical power, and lived next to each-other. Compare that to a drone operator and someone hiding in a cave, that learn of each-other's location. Or revealing the political preferences of those who support the party in power, and those who support the banned party. The surveillance may be reciprocal in those cases, but the results are anything but.