I'm gay. I certainly do not have a problem with the girl or her behavior. I am also, however, trained in threat management, assessment, and reaction. You think it's so fucking easy to know what 'right' is in the heat of the moment. You don't seem to want to acknowledge the fact that snap judgements suffer from having to be made by a part of the brain that bypasses rational thought. News flash: when there's an active potential threat, you act first and thinking comes later. It's the difference between being dead or alive at the end of it.
I feel for the girl. The bad guy here is the one who freaked out, screamed that the girl was a threat, and triggered a reaction response.
While I agree that the duck dynasty asshole is also culpable, the police officer is also supposed to be trained in "threat management, assessment, and reaction". His job is to keep his head cool in difficult situations, assess the problem, stabilize the situation so everyone is safe and then do an investigation to determine if someone should be arrested for breaking the law. He did none of this, instead losing his temper and bypassing his rational thought processes and repeatedly beating the crap out of a small teenage girl, using WAY more violence than was necessary to subdue her. All the while also bypassing the investigatory part of the process. In essence, he took some guy's word that he was assaulted, and acted.
While I expect police officers to make mistakes in handling difficult situations and attempting to keep a cool head during highly emotional situations, this wasn't even an exceptionally demanding situation for a police officer to be in. He negligently mishandled a simple protest situation in which opposite sides were engaged in over the top rhetoric. He should be charged with assault, unlawful arrest, and be severely disciplined if not terminated. He abused his power and picked a small powerless target to vent his own frustrations upon.
Just because police officers in this country often have systemic problems with abusing their power does not excuse his behavior and remove the need for corrective action. If we are to ever fix these problems than an obvious step in doing so is to make sure that abusers of the system that violate a suspects rights should be punished to the fullest extent of the law. The problem is that people are so afraid of crime thanks to the media that they grant the police far too much power and offer way too much leeway in their day to day activities. The reason that it doesn't get more media attention in itself is that black people are usually the target of this kind of abuse, and so many couldn't care less. The problem is spreading however, and perhaps as more and more people become targets of these bad cops we may be able to affect change.
There is a very authoritarian streak (especially on the right) in this country, and the pool of people that desire and are selected to be police officers are often authoritarian as well. Add to this a very "us and them" attitude with regards to cops verses the civilian population, and mix in the nature of the job itself, which doesn't usually involve contact with fine examples of human behavior, and you have an ugly situation just waiting to overflow with problems. Now, because of fear of terrorism, these same authoritarians are armed to the teeth and often more of a paramilitary operation than a police force. This further alienates them from the civilian population, and also increases the general fear and anxiety among the civilians, often making them more compliant out of fear, and more likely to make mistakes in situations that involve police officers, because they are so fearful.
Change is sorely needed, and step one is to curb the tide of rights violations by officers. They must know they will be prosecuted if they knowingly do these things, not protected by the very system that is supposed to be protecting the civilian population in this country. Unfortunately, the days when they were simply viewed as necessary public servants is gone, replaced by thugs with weapons that in many cases despise the very public they are supposed to SERVE and PROTECT.