Earlier quoted context omitted.
Those statistics are probably "correct," but missing lots of context. First of all, most police stops and arrests aren't for murder, but for various petty crimes (particularly drugs and traffic violations) that are certainly unevenly enforced, even controlling for other factors (see e.g. see e.g. https://scholarship.law.columbia.edu/cgi/viewcontent.cgi?art... ), so citing murder statistics here to seems a little irre…
I appreciate your thoughtful comment! We should be careful with what we're talking about here: stops vs. arrests vs. crimes committed vs. offenders. They're all different things. The argument I'm making is basically this: the murder statistics are the most reliable, so we'll look at those. We should expect a very strong correlation between murder rates and other violent crime, though. And this expectation of much hig…
Note that applying 50% to the number of 2019 Chicago murders already saturates the nationwide "Gangland killings" in the FBI UCR, suggesting that perhaps many of the "unknown" murders would fall into that category. It would also not surprise me if many of the "other arguments" killings are also gang-related or at least gang-associated. Of course, it doesn't help that ~half of murders go unsolved here (and in many other cities) and gang-related violence is especially unlikely to find cooperative witnesses.
That said, this is only place with a police department not known for its honesty. Other places might be different. Southern states all have above average white homicide rates, but only Louisiana seems to have an above-average Black homicide rate, at least according to https://www.cnn.com/2018/04/23/health/gun-deaths-in-men-by-s... (caveat 1: this is victims, I could not quickly find corresponding data for offenders. caveat 2: most Blacks live in the South, it's not surprising those states might drive the average.).