Remember that you will never hear about a shooting or killing from the left unless there is power and/or money to be gained. Hence you never hear them talk or worry over black on black or black on anything killings. You never hear any talk from them over white on white killings. Only when there is something to gain for them (White cop vs black person) will there be action.
That is why, in my opinion, Black Lives Matter is a bogus organization that does not address the real problem.