If you have personell in place capable and willing to throw bad guys at cameras, your crime problems will most assuredly be non existant, because all the muggers in Gotham City know better than to try something with Batman around.
CCTV is good at mitigating or relocating most kinds of premeditated crime, usually, assuming the bad guy is careful and rational, assuming the bad guy knows about the camera before they commit to the criminal act, which is why, if you're going to install a municipal surveillance system, you should make them as conspicuous as possible, by putting them in big housings, and painting the logo of the local law enforcement agency on it, and maybe even hanging a big old flashy blue light off of it.
It is not good at preventing or mitigating crimes of opportunity or crimes commited in the moment or crimes commited by the crazed or judgement impaired. Best you can hope for is getting enough usable video evidence to solve the crime and/or convict the criminal. Same thing if the camera isn't conspicuous enough, or if the criminal cannot take notice of the surveillance system before they enter into the psyching-up phase of the criminal act.