I really hope they don't put up ever more cameras. We don't need them. Crime has been falling since 1988 and the US murder rate is around 5.4 / 100,000 people. And that is close to its all time low. And terrorism is rare and unlikely to kill or hurt anyone. When can we start rolling out policy based on data and evidence not on fear?
As far as cameras looking at police officers. We need a lot more of that. Police routinely 'beat people up' and conduct illegal searches. They need to be put on a short leash.
You provided the per-capita murder rate. Can you also provide the per-capita for people beat up by police and for illegal searches?