Hmm, really good point, but I still stand by my thinking. I think the expectations should be higher for an organization that is empowered by the state to do violence than for a gathering of citizens. There shouldn't be any expectation that bad actors are just a part of law enforcement in the way that there should be when there is just a group of thousands of people.
And moreover I think that police killings are kind of the top line item because that is punchy, but most activists would say their problem is with the entrenched structures that allow police to behave badly with impunity. It's impossible to sue an officer as an individual for even the most egregious offenses, police unions have fought really hard to protect bad officers and policy, even when people do "win" legal action against the police the bill is footed by the taxpayers, and in general the thousands of bad interactions people have and film that never even get attention. I'm biased, but I think that the system of policing in the country is more corrupted by bad actors than the protests were.