That seems like a reasonable, constructive suggestion. There certainly are structural factors and incentives which make it difficult for a police officer to actually be a "good cop" when it matters.
But self-regulation hasn't worked and isn't likely to work, precisely because those structural factors are so formidable. So instead, we turn to outside auditing in the form of cell phone video — as advocated by this article.
https://asrs.arc.nasa.gov/
which is something that the aviation regulators created in response to some of the dynamics you mentioned.
(I don't know how ASRS authenticates that people making reports are really pilots or aircrew.)