We could continue to go back and forth here, but when you reference a website - the conservative treehouse, with it's promotion of their love of the scumbag Breitbart, known for promoting lies before his fortunate, timely death, pretty much sums up your bias.
If these types of killings are justifiable, we have some serious f-ing problems.
You're making assumptions on what happened when the video wasn't on, on how to interpret what we saw, and your obviously siding with the police to start with. Waste of time to discuss this with you. And if a cop can mistakenly kill someone and get away with, that's ok. No intent to kill, so he gets off? Great, give him gun back and cross your fingers.