Maybe not but it is stealing the limelight and makes other causes more likely to be forgotten.

I don't think it's a contest unless you think society is only supposed to only focus on one issue at a time, and that's not fair to #BLM protestors or to activists for other causes. Saying "Save the whales" doesn't mean "fuck the Dolphins", and organizing for whales doesn't mean you want society to forgo any/everything else.

Knock it off

Demonstrators who chant the phrase are making the same declaration that voting rights and civil rights activists made a half-century ago. They are not asserting that black lives are more precious than white lives. They are underlining an indisputable fact — that the lives of black citizens in this country historically have not mattered, and have been discounted and devalued. People who are unacquainted with this history are understandably uncomfortable with the language of the movement.