It's called honor and standards. It's a thing that a lot of people who sign up for police work have.
The same honor that gets a floor lamp shoved up some black guys ass?There are good cops, and I know some, but a lot of them are just quota fillers who issue x amount of speeding tickets a month to get their department more funding. Even worse, some cops use their power to feed their perversion for brutality.
Your right wing skew shines these guys in the most positive of light, but if these guys had more than just a dash cam to document what they did most would turn out to be worse than the guy with the silver bracelets in the backseat.
Not to mention the fact that they shoot every dog they see when entering someone's home.