Authority figures are regularly given a sort of indoctrination on induction. It's us vs them, they're criminal scum, etc etc. You can't have a civil conversation with a cop, even an off-duty one, about how criminals might be driven to criminal acts by things beyond their control and how they're still people. They simply choose that lifestyle and therefore are unequivocally The Bad Guys. It's in the entire culture, one person isn't going to change it. I do generally dislike cops, and I know there are still some good ones - but they're holdouts, and even they usually only hold out so far or so long before they fold to the cultural expectation for them to be overbearing bullies and thugs. Good people don't become good cops, good people lose themselves becoming cops.