"Black Lives Matters" are accumulating some powerful voices from the Black Community ...

Good for them!!  They also need all those super rich Black Americans in the music industry to back them too instead of them being happy just making their billions and ignoring what's happening to the people with the same skin tone as themselves.

In the last video, the murdered man Castile's girlfriend Diamond Reynolds  says that "all lives matter" not just Black lives, because the police can come for anybody.  White, brown, Asian, anyone. She's is absolutely right ... we all need to stand up against the injustice done to citizens by the sadistic bullies aka police officers.
It's no longer  justifiable to say that although the black community makes up only a fraction of the American population (estimated to be 10% at last count) that that community commits the most crimes.  Look at it from their point of view and walk a mile in their shoes and see how you would feel if you were constantly under surveillance because of your color or reputation. Shoot to kill has become the accepted norm with the US police.  From January of this year alone, 123 Black Americans have been shot and killed by the trigger happy bullies of the police force.  Condemn the police for their vile actions.  If you don't, the well-known poem below might one day come back to haunt you.

First they came for the Socialists, and I did not speak out—
Because I was not a Socialist.

Then they came for the Trade Unionists, and I did not speak out—
Because I was not a Trade Unionist.

Then they came for the Jews, and I did not speak out—
Because I was not a Jew.

Then they came for me—and there was no one left to speak for me.

..........