If a cop respects another cop's family, that's suddenly corruption? I know; law enforcement is different. But traffic tickets are not quite earth-shaking. They're the flu-shot or will-writing equivalent.
Police face people every day, not very nice people, so we don't have to. Its a great civilizing influence, both for criminals and for folks considering potential vendettas, to know the police will handle it.
But to do their job, officers have to start from a solid foundation. They have to know their families are safe and taken care of, like anybody else. That their community respects them.
It's ethically questionable, of course. But so is writing a will for a friend, or giving free flu shots to the neighbor's kids. Avoiding the expense (and income tax!) and all that.
I've got way better, more important things to worry about than what's at heart, a personal matter for law enforcement officers.