Most people are murdered by people of their own race, usually family or friends. And this is something we've decided to tolerate because 200 years ago, a bunch of barely literate slave rapists couldn't define a Militia clearly. And when this happens, the murderers are held accountable.
The reason why black people and DECENT white people get upset about the murders of Ahmaud Avery, George Floyd, Laquan McDonald, Mike Brown, Tamir Rice, Sandra Bland is because they are murdered for petty reasons by people under the color of law.