Such videos are not the only basis on which to make the argument I put forth. But you'll also find many sources of police videos that are not "released" by the police, but secured by FOIA requests. There are of course examples of videos with police planting evidence, or using excessive force, or other unfortunate things. But by and large, you'll see over and over, the police behaving admirably and in the public interest.
No, it's not fundamentally flawed. It _may_ be flawed, but just because you imagine that the available videos are somehow skewed in one way or the other, does not mean that you're correct.
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.
> you'll see over and over, the police behaving admirably and in the public interest.
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.