I don't think you should extrapolate the level of corruption by the numbers of individuals turned in by their peers. it just as likely means the peers are just as corrupt, and the system is being used to protect itself. with all the instances of the FBI, IRS, being used to target political enemies its pretty clear the system isn't working as intended by the FF. a deviation I am comfortable calling corruption.
heck most of our corruption is just done out in the open. We have a Supreme Court member taking benefits from donors, has that Democratic senator finally left/been kicked out? Lobbyists, and pork spending provide plenty of "legal" corruption within our system.