The commenter is not saying “where, physically are the good cops.” They are not saying “good people don’t exist in the police department.” What they are saying:

The commenter is not saying “where, physically are the good cops.” They are not saying “good people don’t exist in the police department.” What they are saying: “when these terrible episodes of brutality happen, often over a number of years within the view of fellow officers, where are the good cops stepping forward and policing this, or at least preventing departments from institutionally providing cover for the wrongdoers.” We’ve seen a common pattern many times where abusive officers do terrible things over a period of years and get away with it until they are caught due to their own mistakes, while the occasional objection gets squashed. I don’t entirely blame the “good cops” for valuing their survival and careers over fighting these battles: I blame a culture that makes it much too costly and difficult for good cops to push criminals out. But this is a broken and unprofessional culture that needs to be uprooted and changed, because a country needs law enforcement professionals that it can trust.