I don't think anyone other than the manufacturers have made claims of cameras reducing crime. You can put all the AI bells and whistles on them, but they're still just cameras.
They're a fallback option, not a dragnet. The police are generally reactive to reports of crime, not proactively trying to piece together the details of everyone's lives and nail them the moment their dog poops on the sidewalk. No AI can even do that anyway and it would be a waste of money.
There are two vocal camps of people on these threads that are eroding HN: fearmongerers and grifters. I don't understand how it got this bad, but that's the real crisis here.
I have relatives who are cops and lawyers and city councilmen. No cop is sitting in a back room somewhere tracking all the cars on every street trying to do, uh, whatever it is people here are claiming they are going to do to them.
I won't speculate as to what your law enforcement family members may or may not be capable of when it comes to this technology, but I will speculate on what they will likely do if they found out about an obsessive stalker police officer that's watching their ex-girlfriend and her new partner using this tech: they will likely assist in hiding it so as to ensure that the optics of the justice system are not marred.
The reason I suspect they will behave in this way is not because they're bad people - but because they're likely normal people who are subject to normal influences and incentives. There will be no personal benefit, and significant personal risk associated with whistleblowing on this hypothetical officer, and so they will find rationalizations for why they shouldn't. Why it's fine to let this "one bad apple" go for the greater good of the optics of the justice system.
So it goes.