Civilian-civilian interactions are a separate issue from law enforcement-civilian interactions. It goes to figure that because ~72% of the U.S. population is white, looking at raw volume, white people will be the most killed race by all other races. In civilian-civilian interactions, whites are predominately killed by other whites and blacks and predominantly killed by other blacks; this is a basic observed fact.
Look at criminal justice statistics, look at traffic stop statistics, look at conviction rates and sentencing disparities. Look at a handcuffed black man getting casually lynched over the period of 10 minutes while begging for his life. Look at the generational wealth gap which is still lingering as a product of former racist and discriminatory practices (100-200 years is very little on a macro-historical time scale). Voting rights, Jim Crow, sharecropping, redlining ... the last slave is believed to have died in 1971, to give some perspective.
"Unjustified police brutality" is one circle, and "unjustified police brutality against black people" is a circle within that former circle ... I'd argue a disproportionately large one. No one has said that non-blacks aren't also affected by unjust police force, of course they are - but the data indicates that black people are especially affected. And beyond that, no one has said that non-blacks don't have their own struggles and challenges to face and overcome, personally and societally. "Black lives matter" -- not "black lives matter more than yours".
If you want to find rioters unjustly destroying property, you can find that. If you want to find LEOs unjustly using force and assaulting civilians, you can find that. Of course there will be opportunistic people who take advantage of the protests to cause destruction and harm; of course there will be individuals who conduct themselves inappropriately. So you can choose to focus on that relatively small percentage of opportunists, or you can take a step back and evaluate the event(s) that led to these protests and listen to what the protesters are pleading for.
I think it's fair for us to reevaluate what role we want LEOs to play in the communities they serve. I won't say much more beyond that, but asking ourselves how we want public servants being paid with our tax dollars to interact with the communities and people they serve is a perfectly legitimate question. For instance, there's data indicating that a relatively low percentage of LEOs live in the respective communities they serve; is this something that is worth talking about? (And as a caveat, I understand that policing is an inherently dangerous job, especially given the proliferation of firearms in the U.S., so the community cannot fully dictate police protocols/procedures - but a discourse about better aligning community and LEO priorities is absolutely a conversation worth having, along with discussions about LEO responsibility and accountability).
And that's not say there aren't good cops who do their job ethically and for the right reasons; and that's also not to say there aren't cultural issues with inner-city, poor, black communities related to gangs, crime and violence -- it's a massively complex cultural/societal mosaic with so many variables and inputs that need to be addressed -- but black communities have deserved so much better on so many fronts for a very long time.
(Ignoring the modern vehicle), if you were shown the photo below in a high-school history class, would you think it is from 2020 or 1920?
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