I can't be bothered to run the math now (especially since the FBI tracking hispanic ethnicity separately from race complicates everything), but I believe that according to the 2016 FBI homicide statistics, a random black person is about 10x as likely to kill a white person, as a random white person is to kill a black. (There are "only" 2x as many black-on-white murders as white-on-black, but there are ~5x more white people than black, so the per-capita interracial murder perpetration rate is 10x higher. I'm going by memory, so I welcome a double-check)

Regardless, the media do not hesitate to abuse "one-off incidents". I applaud your appeal to a higher standard, but unless you apply this standard evenly, it is just another form of bias.