> Is the argument that Flock cameras are used for mass surveillance defensible
Its always defensible - think of the children!/terrorists! - and always in the same dystopian direction. Just believing yourself to be being tracked, changes behaviour. Just as in large cities, people moderate their behaviour.
> Just as in large cities, people moderate their behaviour.
Given that crime rates are generally higher the more densely populated an area is (in the US, at least), I'm not sure this is true