I think wanting police to kill fewer people of a certain race is a worthy cause even if it isn't the leading cause of death for that race.
if a = xb + yb + etc and b = basal rate of homicide by cops, x = multiplier for blacks, y = multiplier for whites and etc = the same for any other group you want to input, i don't really care if you are fixated on x, y, etc or b as long as you want to do something to reduce a.
and even with all that said, the fact that the murdered minnesota guy was stopped 52 or 62 or however many times it was in the recent past is a much bigger problem than the fact that he was shot on one of those occasions, as undramatic as that sounds.