This is baselessly asserted: rich people consistently receive gentler treatment at the hands of the police for similar crimes[1]. Black Americans get dinged for this twice: not only are they poorer on average than Whites, but are also disproportionately likely to be brutalized or killed by law enforcement[2]. When Black people do die in custody, their deaths are more likely to be characterized with pseudomedical terms like “excited delirium[3].”
Per interaction they are more likely to experience violence per police office but per interaction black Americans are all about equally likely to die to law enforcement as the average.
[1]: https://www.journals.uchicago.edu/doi/pdf/10.1086/696355
[2]: https://www.prisonpolicy.org/blog/2022/12/22/policing_survey...
[3]: https://www.psychiatry.org/File%20Library/About-APA/Organiza...