From The Restaurant at the End of the Universe (Chapter 28), HHGTTG:
The major problem — one of the major problems, for there are several — one of the many major problems with governing people is that of whom you get to do it; or rather of who manages to get people to let them do it to them.To summarise: it is a well-known fact that those people who most want to rule people are, ipso facto, those least suited to do it. To summarise the summary: anyone who is capable of getting themselves made President should on no account be allowed to do the job.
To summarise the summary of the summary: people are a problem.
N.B. I had always thought this was a truism (albeit slightly tongue-in-cheek), which went hand in hand with “quis custodiet ipsos custodes?”.
Digital, Data & Policy 
You mean these guys? http://gunshowcomic.com/133
Quis indeed. So do the guards guard themselves, with a kind of idempotency at the top?
Or is there a mutual dependency of guard? So that the gaurds guard the public, but the public guard the guards?
I’ve got a sneaking suspicion that – like so many things – this turns into a computer science problem.
I’m desperate to reply: “You’re very clever, young man, very clever, but it’s turtles all the way down!”
Can we define two sets of guards by mutual induction that guard each other?