He "lost control" and unholstered his weapon and waived it at unarmed people who were not threatening him or a threat at all for that matter.
You don't see the problem with that? You're a gun guy. You know totally unsafe that is. You know that the action of unholstering him weapon by itself is an escalation of force. And this guy didn't even go to low ready, he went to....swing it around ready?
There was no reason to "lose control". People were not trying to hurt him. People were not threatening him. People were trying to get away from a bad situation. His actions were a huge contribution to that bad situation.
As stated, he unholstered when he saw two male young adults rushing at him. They stopped when he saw them and started to pull out his weapon. That is seen in the unedited version of the video.
That I have zero problem with in terms of most of his actions at the scene as they are technically all legal. I do not have a problem with him even using force to restrain a "teenage girl in a bikini" who was to his knowledge suspected of violence earlier and was also being very aggressive towards him as he was trying to initially detain her. Again that part of the action I have no problem with.
I DO have a massive problem with his overall attitude and escalation of the scenario. Police are suppose to be trained to serve the public interest as well as enforce the law. Serving means not letting your anger get out of control and yelling when it was completely uncalled for. That is basically why he is being ostracized by his chief for his whole behavior and attitude throughout the scene. I'm pretty sure he was not trained to behave as a police officer like that despite the actions he carried out was technically legal. He deserves a harsh reprimand for that and it looks like he got it with being forcefully resigned. A bit harsher than what I would have thought, but then again this may have been his third strike.
Also, the waving of the gun was not needed either and was dangerous even if his finger was off the trigger. It unholstering it and aiming it at the ground while still restraining the girl would have had the same effect without possibly endangering others however slim that endangerment was.
So moral of the story is the cop was in the wrong for being a douchebag pig, but wasn't technically doing anything illegally wrong. Many of the teens and young adults at the scene were all being douchebags and they got off fairly light considering. I've seen worse when shit like that happens and cops break up bad parties. Much worse.
Still the whole thing being blown up by the media over this is fucking crazy.