Aren't police officers supposed to diffuse potentially bad situations? How did arresting a citizen, that is filming them, helping in diffusing the situation? Bad judgement on the officers and the dog (and the owner) had to pay the price. For those that want to put any sort of blame on the dog, don't have any idea what they are talking about. This dog was a Rottweiller (my wife owned one) and it is in their blood to react exactly the way that dog reacted. You simply cannot just train that out of them. Our dog would get between a parent his child that the dog did not know to "protect" the child if the parent got too aggressive on the child. They can be very loyal and you can train them to be calm and loving, but when they see danger, especially on their owners, they will react and protect, it is in their breed.
It is better to look dumb and not be, than to look smart and not be.