It's a lot more than statistics and statistics will often lie if you don't take into consideration various other things. Blacks and minorities are more afraid of Police and are likely to do something stupid to avoid being arrested or abused. If a white person is being shot by a police officer, it's more likely that he was a criminal and was trying to avoid being arrested or attacked the officer. So I would argue that the circumstances that lead to these shootings are unlikely to be similar.
Police brutality is a problem all around the world. Majority of the people don't experience it but for those unfortunate who experience it on a regular basis, it's a problem that needs to be addressed. We, as a society, have given too much power to lowly trained officers, some of whom just relish too much in the power they have over their fellow citizens. Without checks, all powerful people misuse it.