what does your question have to do with the discussion? Who said the expectation was as you said? If someone is a licensed driver, then they are expected to behave as an adult (not 'better' than anything). Adults get bent out of shape sometimes too. but not over a fucking cell phone like a teenager today might, which if you watched the viedo you would see was the 'last straw' that drove this kid to have his deadly tantrum.
No, his "last straw" was getting tazed, whatever the feeling of that is like when you're laying on your stomach, feeling physically assaulted, and then suddenly there's a painful sharp jab of some object entering your body from behind you. Having the phone kicked from his hand was just another of the acts of belligerence by the officer that were getting increasingly violent. You're trying to make a social commentary on cell phones that isn't relevant here.
My impression is “the kid” had a strong sense of fairness and justice, naively so which is no surprise at 17 years old. But in any case that he was argumentative and hesitant isn’t the problem.
That a police officer was out of line and having a “tantrum” is the problem. Why pull people over when they’re clearly just trying to signal that the brightness of his headlights was distressing them? Here’s the most stupid possible answer to my question, just to get this one out of the way: “Cuz it’s the law”. It’s a petty law of no consequence to anyone and wouldn’t be enforced under the circumstances of that evening by any sane, rational, non-belligerent human being. "But he didn't have his brights on" is another idiocy because it just doesn't matter. If the lights are distressing other drivers then the officer's primary problem to solve that evening was his over-bright lights that were freaking the drivers in his area out. The people who find them to be too bright were not the problem to solve. His job is to protect drivers from unsafe drivers, not go around proving how very fucking wrong they are about a stupid technicality ("my brights were not on!").
Why not sit and wait for backup? One of the most stupid possible answers has already been offered, namely the fear Deven was phoning for some “sovereign citizens” to come shoot the policeman so something needed to be done quick. Deven didn’t utter a single word to suggest this, he’s not spouting any “sovereign citizen garbage” whatsoever. He had clearly seen Youtube videos where people discuss citizen’s constitutional rights during traffic stops, however mistaken some of those sometimes are. But he was right to protest how aggressive and belligerent the officer’s behavior is.
The county prosecutor said something to the effect: “Both could have made better decisions”. Yes, but the ones that matter most, because they’re the most deadly to human beings, are ones made by armed authority figures.