Well, for starters, European police are actually trained professionals (in general, much more so than American police) and have different oversight. American police also handle a wider variety of things that really aren’t law enforcement - things that should be handled by other kinds of professionals.
EDIT: American law enforcement agencies are also home to some of the highest rates of domestic violence perpetrators and right-wing extremism.
American police shoot and kill 3-4 people each day. That doesn’t take into account deaths that occur in jails and prisons due to negligence.
Aside from the transparency issue, did you see how much it’s going to cost?
Four hundred million dollars! The city is cutting back on pretty much everything else but wants to spend that on police radios.
Everyone has to tighten their belts while the thin blue line gets fatter and more dangerous.