> Private photography by individuals that can't realistically pool their recordings is something entirely different.

That's more or less the situation with CCTV cameras though. Its not like there's some national control room where people sit and watch every camera in the country 24/7. Most CCTV cameras are being recorded to a hard disk or video in the premises their located, and for authorities to access it they'd have to turn up in person and ask to see the videos (assuming the storage hasn't been reused yet).