Agree with a lot of this.
I'm a little skeptical of privatizing the police force. While I think it would provide a better outcome in many or most communities, there would also likely be some situations where it goes very wrong. So I think we would see a wider variance of good and bad policing and the worst of the worst would be too much for most Americans to handle.
And I agree that the black on black crime rebuttal is not a good one, I just don't think what you said here would change anyone's mind that is using that rebuttal.