Well, people tend to like to know who is entering their private property.

Or are there cameras watching who is entering your public parks and shit? I have cameras on my house, so people don't need to enter if it makes them uncomfortable, but it's handy for when people try to snoop when I am not around. Neighbours have stolen things in the past, even though it's a tight knit community.

Have also provided the footage to police to prove that said neighbor who stole stuff assaulted another neighbor in the street since the camera covers the driveway.

It only takes one asshole to justify cameras.