The Black Lives Matter movement was started to call attention to police killings of Black men and women. People on the political right argued that the primary killers of Black people are other Blacks. They are right—also true is that Caucasians are the primary killers of Caucasians. But both statistics are irrelevant.
Malaria is caused by the bite of a female anopheles mosquito and kills more than 450,000 people a year worldwide. Dengue fever, transmitted by the bite of an infected Aedes aegypti mosquito, causes about 25,000 deaths per year worldwide. It would be nonsensical to ignore actions against the Aedes aegypti mosquito just because the female anopheles does so much more damage. And it would be nonsensical, irresponsible, and immoral to ignore police killings of Black and Brown people just because other causes of their deaths are greater.