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a huge issue is racism in law and police policies (not necessarily in individual cops) - crime statistics need to be taken with a grain of saltHomicides are one way to dis-entangle this (in jurisdictions not prone to To Kill A Mockingbird asshattery). It's objective as to when it happens. And our courts are relatively better, at least in the post-DNA era, about due process when it comes to such crimes.
It appears blacks committed 52.2% of homicides from 1976 through 2005 while representing 12.3% of the population [1]. The 2013 statistic for "murder and nonnegligent manslaughter" arrests of blacks is also 52.2% [2]. That said, (a) arrest does not mean conviction and (b) we decided long ago, and rightfully so, that projecting population characteristics onto someone who did not choose to be a member of that population is morally wrong and therefore, oftentimes, illegal.
[1] https://www.bjs.gov/content/pub/pdf/htius.pdf page 12
[2] https://ucr.fbi.gov/crime-in-the-u.s/2013/crime-in-the-u.s.-...