As I mentioned in other comments, Goon cops will happily subvert civil liberties by filing false charges of "resisting arrest" and "assaulting an officer". Often as CYA after they have given someone an undeserved beat-down.
The DA is usually aligned with the Cops. The way these false charges play out if witnesses come forward or a video capture of Cop criminality is presented as evidence, the DA will quietly drop the charges and also let the Goon cops off scot-free. If the witnesses to the Butler incident come off as credible, expect that resolution.
So then good for Butler, but the downside for the rest of us is that the Goon behavior is tolerated and those guys will have no compunction about doing the same in the future.