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After reading the FiveThirtyEight article I realized several things, I'm not entirely sure what I think about them, how I feel, or what they mean. But I think they deserve a mention and some consideration.
Out of the sample of 1,913 police killings over 20 months (08/13-03/15) 511 were black, or about 27%. Given 14% of the population is black we get that a generic black person is 2 times as likely to be killed by police as a random non-black person.
That's pretty significant, but also a reminder that not being black will only save you about half of the time.
Then we have the number 1913, FBI homicide data for 2013 says that their were 14,196 homicides in 2013. If we normalize use that as a rate we get 23,660 homicides in 20 months. A little more math gives us 8.1% of all homicides are committed by police officers.
Again according to the FBI website 53% of homicide victims were black, so that gives us...
4.1% of murdered black people were murdered by police
10.6% of murdered non-black people were murdered by police
This I found surprising...
Also I have no data to support this, but my intuition tells me that police acts of violence are almost certainly exponentially distributed according to severity. So for everyone who gets killed there are likely an order of magnitude more people who were beaten/tortured/whatever.
*All my calculations were done assuming that the police killings were counted in the FBI numbers since they claimed to include "justifiable homicides" which include self defense etc.