The existence of the cameras is not the problem. It's how we use the output of them. Vandalising cameras without putting in place (legislative) checks around the use of surveillance devices is short sighted Luddism - so not a valid response
Since crime will always exist and criminals will always one-up law enforcement, it's in our best interests to always use the least possible countermeasures. Time will tell when we've reached 1984, society seems to drift closer and closer — albeit, ever so slowly.