You know a few who aren't to you. You also know a few who know a bunch who are definitely abusive cops. Cops who allow abusive cops to continue policing are bastards.
Even beyond that, the very system that protects cops over the public and avoid scrutiny ensures no cop can actually be a good cop. Good cops get fired or have "accidents" on the job. That's why all cops are bastards: they can't not be in a system like that.