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.