I can't speak to what the parent commenter thinks, but I think it's less the idea that these specific police were racist (maybe they were, maybe they weren't) than it is systemic, institutional racism. Black people are statistically way more likely to be killed by police, and police appear to be largely immune from consequences when they misbehave even egregiously as in this case, the Breonna Taylor case, or many many others. While these killings were obviously tragic and unnecessary, nonchalant acceptance of police brutality and abuse of power remains at the core of the problem that needs to be solved.