Nobody is "targeting" black lives. Although blacks are only about 13 percent of the population, they commit over half of the violent crimes in the US. This results in a disproportionate number of contacts with the police, a tiny percentage of which result in fatal confrontations.
Cops killed 259 black people in 2019, including both armed and unarmed individuals. They killed 406 white people. This is from Heather MacDonald in USA Today:
"Nationally, African Americans between the ages of 10 and 34
die from homicide at 13 times the rate of white Americans, according to researchers from the Centers for Disease Control and Prevention and the Justice Department." We're talking about something like 7000 to 8000 deaths here.
So black people murder each other at astronomical rates, but BLM chooses to focus on police killings of black people. That's their call -- there is certainly a lot of room for police reform -- but it's not where the real danger is.