Black lives matter?

This is a genuine question. But why do people scream that black lives matter and protest about it when it’s white on black crime, but if it’s black on black crime then everyone is silent. Do black lives only matter when it’s taken by a whites person? I don’t get why people don’t have the same energy when it’s black on black crime? Please don’t cancel me i’m just genuinely curious and want to know the reasoning behind it.
Black lives matter?
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