I've met a ton of really good cops in my time. They have my intense respect. Their job can be demanding in the extreme . . . and I'm not just talking about the mountains of paperwork . . . though there's THAT, too.
Trouble is, there's a certain percentage of cops drawn to the job for all the wrong reasons who have, for untold decades before the advent of cell phone vids, been riding roughshod over the citizenry, nearly unchecked.
One thing I noticed the most, which was most apparent in small jurisdictions, is that the tenor of the officers flowed directly from the Chief. Good Chief, good officers in the main. Asshole Chief, many asshole officers.