What I have a hard time conveying to some of my more sheltered friends* is that the actions of "officer slam" are not remarkable. They are commonplace.
And given how common this is "officer slam" probably felt he was just doing his job. For too many young people that kind of interaction is normal. Think of what that does to young minds, to a learning environment, to a community.
Too much of the reporting makes it seem like this is some terrible unheard of thing that has never happened before. It is terrible to be certain, but it is not unheard of. What is remarkable is that we have a video. Many other videos have been deleted, or students never had the chance to make them since no phones are allowed on school grounds.