re: This quote from BLM activist is evidence of police bravery...

The key thing is that whether or not any individual officer acts bravely, we all expect them to.
What would BLM protestors have thought if the police ran away from the shooting in their cop cars?

So BLM wants:
1. Brave cops who will go to shitty neighborhoods in the middle of the night walking into unknown danger, walk towards the gunfire, etc.
2. Cops who exercise perfect judgment at all times.

No matter what we pay them, no matter how we vilify their compatriots, no matter the sound reasons cops have for their prejudices, they want brave cops who don't make mistakes in what they perceive to be life and death situations.

We certainly IMO need to examine police philosophy, how they are to handle situations, where their power stops, etc, but those discussions are pointless if we are going to vilify cops who fall short of unrealistic standards.