THIS!!
I imagine that most officers don't join hoping to be the glorified mobile meter maids that they are, but, that's what most policemen have become.
It's been proven again and again that "speed" is not to blame in the majority of accidents, poor suburban design and driver distraction is far more often the cause. Speed makes those errors deadlier of course, but the guise of public safety as a reason to pull someone over doing 10 over is all a lie.
To protect and serve does not mean to sit and scalp commuters driving home from work, pulling in thousands of dollars monthly straight from the peoples pockets. Police are generally reactionary to any crime, very rarely preventing anything, but that's what happens when you jam all your officers in patrol cars.
I would love to see police ticket people for failure to signal, for distracted driving, or my favorite, driving slow as hell in the passing lane and refusing to move over. Hell, I don't know why officers don't stop to help stranded motorists. The sad fact is though, most policemen in America will spend every day in their car, issuing ticket after ticket for years on end, occasionally responding to a crime.
Officers have made themselves bill collectors of the state, and people see this. I have dealt with some great cops, namely when I was hit head on by some dumbass. Most of my interactions with them have built the perception that most are pricks, despite the positive impressions of a few.