Yes. I understand most of that. Some if it I don't particularly like your description, but, in general, I agree.and you understand that municipal police departments are trained, hired, screened, supervised, under the organization known as a municipal corporation and subject to no oversight by any entity other than that of the municipal corporation's elected officials? and you understand that there are at least 17,000 separate, independent, policing authorities in the United States, each governed and overseen only by elected and appointed municipal officers?
and that there is NO mandatory requirement that they report ANYTHING to ANYBODY except the aforesaid elected and appointed municipal officials?
They are accountable to a chief of police, a mayor, and a city council. The people of a community elect those people or, in the case of COP, they are appointed by an elected person or group. So, there is community accountability. Obviously, there have been some spectacular failures that we can point to, but that accountability keeps most police departments honest and responsive to the community they serve.
Where your narrative leads is toward federalization of local police - which I strongly oppose. First, I would need an example of where federalizing any thing made that thing better. Secondly, despite ample examples of where community accountability has failed, that community still will have a better sense of what needs to be done than some anus sphincter sitting at a desk in DC. FWIW