Where do we see that? The police camera footage? As I explained, those are not reliable.
Note that I am not arguing against police in general; I agree with you that they are necessary. But your stated source is fundamentally flawed.
As I stated, if it was simply one source of the videos, with one agenda, then perhaps you'd have a stronger argument. But in fact, that are many more people who are interested in the videos that expose police corruption, and they tend to be more circulated than the others. That is the benefit of the FOIA; as citizens we can get access to police body cam videos, when anyone alleges that there has been malfeasance in a given case.