How does that make any kind of economic sense? Morals aside, that’s a ridiculous amount of devices, data collected and transmitted, and so on.
The bottleneck in solving crime is going after the criminals. There's already not enough resources to go after the crimes that are open and shut.
And it's not really that expensive, and the idea is that it ultimately saves money in terms of the crime it prevents and fewer police and detectives needed.
I'm not defending it, but in terms of economic sense it's quite well justified. Opposition to it is moral/ideological around privacy/freedom, not economic.
It's not about economics, it's about control.
There's only so much military-grade vehicles you can spend that on, I guess. Cameras will do.