I remember seeing this result. It's tantalizing but - and in the absence of mandated reporting perhaps the best we may have. I will take a look at the paper but I wonder what biases exist in officer-initiated reporting.

Lastly, we're setting a low bar if our standard for police mistreatment is killing as opposed to inappropriate behavior, writ large.

I do see your point, but I'm not sure this data undercuts the importance of a movement like BLM.

EDIT: For the second link, I'm not sure how much I believe a psychology experiment in this setting - I don't know this literature but my a priori bias is that the individuals who would do this type of study in Seattle are not representative of the median US police officer