Look at the context though. You're saying that within a conflict that involved mostly black people an incident involving a white person wasn't amplified. But lots of additional blacks have been killed during the protesting, and you haven't heard about them either. That's just a function of signal to noise ratio.
I think a much more telling situation is when a crime gets committed, how do the police respond? Do they really respond as if all lives have equal value to them?
If they do, how do you explain death sentence carried out immediately for selling loose cigarettes or running from the police, but a man who shoots 6 people dead in a church being not only taken alive, but driven to a Burger King for a meal before being taken to the station for arrest?
How can you possibly explain those differences without concluding that at least to those cops, black lives definitely do not matter as much as all other lives.
RE: Why Poor Whites and Anarchists Should Support Black Lives Matter