How fast would they have charged a non-cop with assaulting a police officer if he made a similar move during a stop? Exactly.
Where would that leave an average citizen without rank if a connected cop lunged at him? The USA has been corrupted by those with an attitude, connections and position who believe that only they deserve immunity from justice and others prosecuted.
Like Leona Helmsley the wealthy hotelier bxtch said, taxes (and injustice) are only for little people.
https://en.wikipedia.org/wiki/Leona_Helmsley