black arrests (all crimes) a year: 2.2 million
white arrests (all crimes) a year: 5.6 million
https://ucr.fbi.gov/crime-in-the-u.s/2017/crime-in-the-u.s.-... black deaths by police: 4.5 per 100k
white deaths by police: 1.5 per 100k
https://www.pnas.org/content/116/34/16793 USA black population: 13%
USA white population: 75%
Given a black committing an average black crime, and a white committing an avg white crime, the black person is 16% more likely to die in a police altercation. Whether or not this is statistical error or a real difference is harder to tell, but this difference is not nearly as large as most media outlets lead people to believe.Again, If someone has numbers that tell a different story I am all ears
But as has already been pointed out, it's way more than 30%. The numbers given in the original comment hide the real impact of the bias, since "arrest" was implicitly being treated as a fair event (which it isn't; as just one example, blacks in particular are many times more likely to be subject to a traffic stop than whites, while they tend to have contraband on their possession less often [1][2][3][4]).
Moreover, this isn't just about deaths in police custody. This is about inhumane and repressive policing practices that perpetuate a longstanding effort to deprive blacks of meaningful political power [5]. It is both foolish and cruel to see an entire population struggling and assume it's because they are bad people.
[1] https://sfdistrictattorney.org/sites/default/files/Document/... [2] https://chicagopatf.org/wp-content/uploads/2016/04/PATF_Fina... [3] https://www.aclu-il.org/en/press-releases/traffic-stop-data-... [4] https://www.nytimes.com/2015/10/25/us/racial-disparity-traff... [5] See Michelle Alexander's book, The New Jim Crow