The Buffalo incident offers a vivid example of why police records should be considered unreliable. Where are the "good cops" among the 20 or so in the video who had the opportunity to speak up, but in practice chose to maintain the blue wall of silence?
Imgaine how hard it is for us to admit a mistake at work which brings the website down but here someone's life is at stake.
What happens if a cop makes a mistake and causes grave injury to someone. What would be his incentive to admit mistake and possibly spend rest of his life in prison.
That's a far cry from this situation. There is no "judgment call" here: don't violently shove elderly people to the ground for no reason. If you accidentally do, help them up. If you pass by an elderly person lying on the ground and bleeding, check on them.
There's no "mistake" here.
If you're a passenger on a plane whose pilot is doing something unsafe, you'll probably never know, which is different from if you're a victim of abuse by police (because you'll directly experience the consequences individually directed to you). Nonetheless, the pilot's unsafe behavior also has a real potential to harm you, just in a way that doesn't feel intentional or personal, and in a way that's almost always invisible except in case of an after-the-fact investigation.
There are lots of ways that the analogy breaks down, but I see one where I disagree with you: policing does also have "lots of very complex and nuanced situations [...] that require judgment calls" alongside the situations that are best described as willful abuse and crime.