You know, I actually had a talk with a BLM member.
She explained how she viewed their movement.
It was that all lives mattered, but at the present, blacks lives were not as 'valued' as white lives in the actions of the police.
And the phrase was meant to bring attention to that.
Considering the choking death of the guy in New York just for selling loose cigarettes... as well as other incidences, I can't really blame her.
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Imagine how a small town police department would react to a large crowd of young, armed black men holding a meeting in front of a Wal-Mart. And then imagine a rally for open carry in small town, let's say, Texas.