Yep. And when an agent reports excessive force, or corruption, they are often fired. Sometimes those firings create terrorists, like Christopher Dorner. So I'd say the police have the incentive thing figured out, even at an expensive cost to society.

>Christopher Dorner.

"Dorner issued a single demand: a public admission by the LAPD that his termination was in retaliation for reporting excessive force. He also asked journalists to pursue "the truth", pointing out specific lines of investigation for reporters to follow under the Freedom of Information Act, and said that "video evidence" was sent to multiple news agencies."[1]

[1] https://en.wikipedia.org/wiki/Christopher_Dorner_shootings_a...

Usually I don't side with people who go on murderous rampaged but Dorner went on his rampage because he was pissed off by the LAPD's use of excessive force.

I think you'd have to say that the fact Dorner killed people is unquestionably wrong. However, his superiors shouldn't even be allowed to fire him for reporting excessive force, and whatever evidence there is should have been examined and gone high enough up the court system until the LAPD was completely overhauled with staff who didn't find it so expedient to use such incentive structures to to get away with behaving in such awful ways.

Not only that, the subsequent response to Dorner seems to add a lot more credence to his allegations than his deranged behavior would suggest.