It is still a highly human resource intensive process to investigate and punish crimes using that surveillance. It doesn't get used to identify who broke into your car and stole stuff out of it, because they just don't really care about that. They do care about everyone who was at the demonstrations, which affects the police directly and which threatens the role that the police have in protecting private capital. If you understand what their role and focus is then the lack of enforcement on petty crimes isn't a counterexample at all.