I haven't read all 11 pages, so apologies if this has been covered!
I've had someone open a car door on my car whilst I was sat in it, when I approached them (they were about 50ish) they replied 'so what' and walked off.
I popped in to mother care a few years ago with my pregnant wife and came out to find a dent in my 2 year old Audi TT.
To be honest CCTV or not, I believe you're parked at your own risk.
I always think everyone gets their come-up-ance and they usually do. I lived in a cul-de-sac and my 2 neighbours used to park on the road instead of their drive, so when I came back on a Sunday with my race bike on it's trailer I had a hell of a time reversing it in. A few months later, both neighbours reversed away at the same time and hit each other
Ian.