If people knew how many hi-rez cameras were trained over their houses at 2,000 agl doing aerial surveys, I bet you would hear about it. Public perception is a major consideration in aviation. One of the wickets we had to get around in design school was public reaction to sound pressure levels- designs had to show they were not loud enough to bust adverse reaction standards. You would be impressed how much the government knows about this. A large amount of data was compiled on this in the 40s-60s before the NIMBY crowd became active.