I think the author was getting at one part of the issue - that proportionally to the number of encounters between police and black men (typically, it's always men, regardless of race), there isn't a higher rate of violent endings. So the idea that black men are killed or attacked more frequently than their rate of population is backed by the data, but when compared to the rate of arrests/encounters, there doesn't appear to be as clear a difference. So the real discrepancy seems to be in the number of encounters, not so much how they end. (Though, the other link does show that cops tend to be more "hands on") I would fill in the blank with race as the prime factor for why there are more encounters, however. I don't think the author was daring to go that far though. For me, the reason black people are disproportionately (to the population) having encounters with police is likely due to poverty which is a byproduct of generations of socioeconomic racism. That seems to be the real problem, but it is worth pointing out that some of the "blacks are killed more often" rhetoric may not be the entire story.