None of what you wrote negates the fact that black on black homicide is anything less than alarming.  To care about that phenomenon is to care about black lives in a genuine way.  

You say:  "All reliable statistics that I have seen indicate that when a murder is committed, both the assailant and victim are of the same race."  True.  But does this diminish the significance of huge numbers of black on black murder?  

Next, you say "White on black crime often involves racial bias."  True, as does black on white crime.  But does this diminish the significance of huge numbers of black on black murder?  

You close with:  "And all police officer shootings ought to be investigated closely."  Granted.  

So although all three of your statements are true, none of them diminishes the size of the huge elephant in the room --- black on black murder.  Black Lives Matter should be responsive to instances of real 

cont'd