"Besides, the proliferation of CCTV tends to encourage vandalism: specifically, people will try to vandalise the CCTV cameras. This means you’d need a second CCTV system with cameras pointing at the first CCTV system, and a second set of bored security guards to watch live video feeds of motionless video cameras."
I always thought that was part of the art of CCTV arrangement.You tried to position cameras with two ideas in mind:
1. The cameras are out of arm's reach (since spray paint isn't effective much beyond that). That way, any attempt to paint the camera involved a climb or other endeavor which inevitably meant significant face time (defeating the purpose of painting the camera).
2. The cameras had overlapping coverage, meaning as well as covering various complementary areas, the cameras also covered each other's danger zones: places where another camera could be attacked, perhaps even from a distance (using say a paintball gun). That way, any attempt to attack a camera puts you in the view of another one. I know the quote mentions this, but I'm saying this "watch the watcher" doesn't necessarily have to mean you cover just that camera. A good field of view means you can see plenty else besides that camera.