There have already been instances of well armed African-American people openly carrying large guns forming parts of these protests. The effect? The police have known better than to respond with violence.
And yet in Vallejo this week a Latino man was shot for suspicion of having a gun in his pocket (not a crime) which turned out to be a hammer (also not a crime).
Not the same thing in the least. I'm talking about people openly carrying guns as 'scary-looking' as assault rifles. I found the story you referred to. The difference is, the victim (at best, from the perspective of the police' defense attourney) looked to be hiding a concealable gun (not saying he was, or that the incident wasn't an atrocity): the man looked relatively defenseless. The people I'm talking about have the appearance of being able to win that same shootout, and the police can see it.
Genuinely curious: do you have sources showing this?