My daughter manages a large department store - she and managers of other stores often go through store video in spare time. She accidentally caught a trusted Deputy Manager doing refunds on returned items to her credit card when she saw her swipe her card at the checkout where there were no customers. The stocktake had picked up an unusual number of large items (tv's, fridges) missing and she couldn't work out how shoplifters had taken them. Turns out, the DM would lodge them as returns when nothing was returned, and put the refund to her credit card. At first she'd replace the money and log the item as sold again so that everything added up, but then just kept the money, so the stock take figures were out. She ended up taking at least 50k that they know of - clearly, there should be something in the computers that pick up repeated transactions with one credit card. My daughter tells all her staff to just do the right thing and then the video surveillance will only be used to laugh at the shoplifters who stuff legs of lamb down their track pants or make fun of the man who pleasured himself in front of the television sets.
I see our high school (Australia) is putting a lot more video surveillance in to catch any theft, bullying, violence, or other incidents. Kids aren't happy about it. Teachers are divided because things can be taken out of context - you see a big hulking boy push a girl over, but you haven't seen the months of nasty jibes she's hit him with, the remarks about him being fat and stupid, the mocking, the derisive remarks, and the fact that she bullied his little sister. Of course he shouldn't push her, but he's not the brightest crayon in the box and it was the reaction he understood against ongoing attacks he didn't understand. Was it a case of bullying or escalating conflict? The video will indicate bullying and physical assault. Video surveillance can be used the wrong way.
Also - just to give into my paranoia - you just know the Chinese and Russians are going to be hacking those systems to spy on us.