It sounds like we both agree but I think there was a miscommunication. If the poster had originally specified that "blacks have more to fear from cops logically speaking" I'd say sure, the statistics do seem to support that. The quote was more about "blacks have more to fear from whites" and no where specifically mentioned fear related to police. Police are a small fraction of the total population (less than half a percent) and do not seem to commit enough violence per capita to adjust the overall racial breakdown of violent crime. They might be scary, but that should not translate into a fear about whites in general (as you seem to agree).
Secondly I agree wholeheartedly that we need better data on police violence. Even the most careful statistical analysis to date (by Roland Fryer) was lacking in the generalizability of it's results -- specifically because we don't have this stuff nationalized.
People unfortunately have to worry about more than just violent crime. So specific race-on-race violent crime rates are a bit inadequate when trying to answer the question "Do minorities have more to fear from white people?"