Citation needed, particularly for Nature. As far as I can tell the supposed disparities are explained by the amount of violent crime the race and ethnicity commits (leading to more police interactions), but it's impolite to bring that up.
Again I have yet to see any convincing data that supports this. There's a marketed list of names of victims, some with video footage, but I can also show you names and video footage of non-violent victims of other races being killed by police.
I certainly support police reform (within the bounds of common sense), and continuing to try to lift black folks up, who I agree have been systematically discriminated against for hundreds of years. But doing it under false pretenses has already opened up a Pandora's Box of racist moral panic when it's simply not there.
What pretense are you saying is false, exactly? That there is a pattern of police abuse towards non-violent black people? It's patently silly. Black people have "the talk". White people don't have "the talk". We have videos of obvious injustice and racism popping up all the time, and the one-two punch of Ahmaud Arbery and George Floyd being killed by people who are obviously, deeply, racist and nothing being done about it (indicating a severely dysfunctional police organization) catalyzed the "moral panic", but there's no such epidemic of videos showing white people being abused. Why? Because there is no such epidemic, and it is racist.