A lone officer, a young man not obeying the officers instructions, a young man walking back toward a vehicle the officer hadn't searched, a young man making movements toward his pockets when the officer hadn't searched the young man.
I would say the officer has a justified concern for his safety.
Could he have handled the entire affair differently and/or better?
Sure he could have but we don't have the option of do overs.
I completely disagree. This cop didn't waste time telling that man that he was under arrest and then didn't waste time warning him that he was about to fire the taser, either. Just shot him and thought it was funny.
It is very clear from the tape that this young man and his family pulled over immediately and furnished the documents quickly. The young man's only crime was believing that the police officer was honestly mistaken about the situation and that he could discuss it with him like an equal.
Silly guy, right? After all, we should all be treated like dope-smuggling escaped felon gang-bangers, just because we aren't cops.