The relative difference between black and white suspects killed might have nothing to do with race. I'm too lazy to check the numbers, but superficial knowledge suggests that the difference might be due to socio-economic position. Ie.:
whole population B/W make-up: 72 % white (I guess this is not true anymore, but let's stick with it), 12.6 % black
Now let's suppose that victims to police shooting are chiefly among the poorest 40% (I guess this is true, but I'm happy to be corrected if not). Suppose now, that the share of blacks among those 40% approximates twice their share of the whole population, then we would have ca. 25.2% and that whites only make up 40% of the poor quintiles, then we are roughly at the estimated share of police shootings. "The racist component" would then only consist in the relative difference of poorer B and W population. For the blacks we have both numbers, ie. ca. .8%, which still represents 88 (notice the Heil Hitler component!) for 2014. The more pressing problem though is with police-lower class relations and/or lower class violence (and the police's reaction). Rather then just blaming everything on racism, one could instead focus on police's trigger happiness (eg. stronger punishments and inquiries of police killings) and on measures against lower class violence (eg. restriction of access to ammunition, just as with tobacco).