A lot of the videos portray violent rioters/looters. A lot of the ones of the police are ambiguous because they don't show what behavior warranted the police reaction.
I've also seen a lot of videos of peaceful protests with police walking/talking/marching with the protesters.
We do justice a disservice when we lump everyone and every precinct together.
Rather, the repeatedly demonstrated fact that the system is willing to protect the "bad apples" (read: outright thugs) corrupts the entire policing system and undermines its legitimacy, regardless of how many benign officers there are.