Again by this logic prisons should be free of crime, rather than hotbeds of it. Insisting that something is true because it makes sense to you doesn’t make it true.
Prisons don’t have cameras in cells where most “bad” stuff happens. It’s a also a manpower problem but that’s probably going to go away with LLMs being able to auto review videos at some point.
It would only solve crime if the police actually followed up on all areas where surveillance pointed out crime. Surveillance itself can't arrest a criminal.
This assumes the people watching actually cared about stopping crime enough to step in and arrest the offenders.
To echo the topmost comment's point, you can't convince the public that law enforcement actually cared when the elites who flew on the Lolita express to the child rape island are facing zero consequences while urinating on the side of a highway gets you put on a list forever.