I think you'd be a lot less smug and confident if it was your car that was stolen and the thief would have been caught if the cops could use an automated license plate reader, but were forbidden to because some dipshit stalked his ex. I don't know the right answer.
The right answer is obvious to anyone who's considered this for even a second. It's got two main parts: End Qualified Immunity, make the standards for becoming a cop much higher, institute a mandatory national database of cops ineligible for rehire due to committing crimes in uniform.
Right now you get out of community college and into a police department. That's laughable. By definition you've got a bunch of young-ass cops who don't know shit about shit running around out there. Then they also by definition aren't held accountable for their actions, which is the MOST important thing in policing. And finally the worst cops can usually get rehired somewhere else so desperate for cops they don't even do background checks. And they're desperate for cops because all the other cops quit already, ever wonder why that might be?
I don't think the answer is "Flock for everyone without a warrant or due process"...nor is it "No one can use surveillance technology in law enforcement ever!" The right answer is somewhere in the middle, IMHO.
The cops we have now should never be allowed to use Flock. If we had higher standards, and therefore less shit cops, then maybe we could talk about it, but any rational process would still require a warrant for any records request, and that requirement should be on the cops' side. They should not be allowed to request any records from anywhere without one, period.