It sounds like the viral video was of a different case of police brutality.
The video from Molly’s Pub was “was collected as well by responding officers and will be part of the investigation.”
From my experience, the level of corruption in a department is inversely correlated to the number of officers fired for corruption. Locally, we have departments that fire a couple people each year, but that is because they deserve firing and the departments work to get the bad seeds out. Other departments never fire anyone until the U.S. Attorney’s office gets involved. Those are the bad departments.
Every department has bad officers, the difference is how the department deals with them.
If the good officers aren’t actively stopping the bad officers in the act of a crime, or reporting the bad officers when they learn of the crime, then they are accessories to the crime.