Since moving to San Francisco 5 years ago I have been attacked on the street 4 times and had property stolen from my home 3 times. In only 1 of these cases was there a witnessing camera. I think there is a very real tradeoff between safety and privacy, and I personally feel like my city would be better off sacrificing privacy in favor of more safety.
Of course it could be used for dumb shit like giving out jaywalking tickets en-masse. And I'm not sure there's any existing agency I trust to draw the line correctly.