Also being not an American, I'm puzzled as to how there is apparently no requirement to report self-defense killings to the police. I guess when they find dead bodies in the street, they just assume it was self defense?
He called his friend who owned the gun. No need to call the police when they were less than a block away. I'd also imagine that 911 was swamped given how so much of the city was being destroyed.
The protests were about perceived police brutality.
Cop's view:
A guy had a knife in the seat that they'd seen previously. He was wanted for raping his a woman and was in the process of stealing her van and kidnapping her kids. Even if there were no knife, you don't allow the rapist to get into the deadly weapon and take kids as hostages.
To them, the riots were unjust and a lot of them probably wanted to stop the city burning, but they were told to cordon off the area and basically forbidden from doing anything. At the same time, if they had to use force against a violent rioter, it would be all over the press and that officer would probably be fired. This leaves the armed citizens as the only line of defense (and a line without the police politics). This seems like the reason why they praise them in their interactions.
Politician's view:
The city is run by one family of Democrat politicians. Their party officially supported the riots with the now current Vise-President actually raising funds for the rioters. Going against the mob would not only go against the party, but it would cause the mob to show up at their houses (this happened in other cities) and might even throw their family's dynasty out of power. They didn't care about the part that was burning because it was the poorer parts of the city.
Citizen's view:
The politicians ordered the police to abandon them. They had signs like "we have little children here" in an attempt to keep their families safe (it seems that even having BLM support signs wasn't enough). The businesses were generally either not insured or under-insured. Lots of people worked at those places and were looking at not having a job. Everyone's cars were being demolished or burned. For many of them, everything they spent their entire life working on was ruined in a few hours.
Amed Citizen's view:
We've been hiding in fear for two days now as the police do nothing. If they won't, we will. Today, we're putting a stop to this.
Rioter's view:
I just did what I do best. I took your little plan and I turned it on itself. Look what I did to this city with a few drums of gas and a couple of bullets. Hmmm? You know... You know what I've noticed? Nobody panics when things go "according to plan." Even if the plan is horrifying! If, tomorrow, I tell the press that, like, a gang banger will get shot, or a truckload of soldiers will be blown up, nobody panics, because it's all "part of the plan". But when I say that one little old mayor will die, well then everyone loses their minds. Introduce a little anarchy. Upset the established order, and everything becomes chaos. I'm an agent of chaos. Oh, and you know the thing about chaos? It's fair!”
Humanity is the same everywhere and looking at history shows this to happen every time a local power vacuum is created and mobs begin to rule.
The two police in the vehicle testified during the trial.