There's two sides to BLM, the civil rights side and the radical political side. Unfortunately it's difficult to distinguish between the two because they won't formally organize to present a unified position and face accountability. So now we have this nebulous entity which is attempting to achieve positive change but doesn't have the credible authority to categorically denounce those who perform heinous acts in their name.

If BLM won't make the attempt to officially organize and codify their position, they can't be accepted as legitimate.

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