I think you didn’t finish reading the piece about media bias in the creation of the myth of an epidemic of police killings of blacks. If you had read beyond the paragraph you quoted, you’d have seen that the arguments you raised were rebutted. Of course, it’s not just about comparing absolute numbers of blacks and whites in the population to blacks and whites killed by cops. You have to get more granular than that, as that article does, and when you do, you still see a slight bias against whites. I’m not going to recreate the whole argument here since it’s described pretty clearly in the other article.

As for the point of the protests, while Colin Kaepernick himself may have been protesting for the reason you note, I don’t think that’s true of all these other jumpers-on-the-bandwagon. To quote for you what I wrote in response to someone else a few hours ago:

I was saying that most of the people doing the protesting now, i.e., this past weekend, don’t know [what they’re protesting about]. I actually arrived at this insight from listening to a bunch of comments from athletes and coaches during press conferences after the fact, when they said many different things and spoke vaguely of racial injustice of one sort or another or just spoke about standing together in a show of unity or expressly spoke about how it’s still too early to tell what this is going to be about. So, yes, I’m convinced they don’t know specifically what they’re protesting or what they want. As I said, if you think they know, tell me exactly what their goal is and what change made by whom would result in the protests ending. Usually protesters have demands. What are theirs? They have none.