The point here is that an awful lot of white people don't see gang violence as the fault of the police, of society, or of white people. You can say of course that is mistaken, but clearly there hasn't been a compelling story that has penetrated peoples' minds that links the violence with the ultimate responsibility. Changing people's beliefs usually seems well-nigh impossible, but shaming them without trying to convince them they are wrong seems even more pointless to me.