Why doesn't anyone want to impilement that system?
Because it is absurd - it completely neglects game theoretic incentives. There is no reason for any human to expect benefit to come from giving you ultimate power. It would be irrational for you not to defect once you had power given that the humans do not have a reliable way to predict your conditional behaviors.
You obviously need to find a way to prove to humans how your source code functions, doing so in a way that doesn't allow them to modify said source and run it themselves for their own ends. Given 30 seconds thought I can not think of a way to do this.
But humans weren't merely objecting on the grounds that I might not be able to fill the role of the objective enforcer -- many are opposed to the idea even if that problem could be solved, and I think it is fair to take that as evidence that such humans don't actually want to be able to send better signals.
Evolution. Morality. Strategy. Security/Cryptography. This hits so many topics of interest, I can't imagine it not being discussed here. Bruce Schneier blogs about his book-in-progress, The Dishonest Minority:
I am somewhat reminded of Robin Hanson's Homo Hypocritus writings from the above, although it is not the same. Schneier says that the book is basically a first draft at this point, and might still change quite a bit. Some of the comments focus on whether "dishonest" is actually the best term to use for defecting from social norms.