Part of this is about how we draw a balloon around what ‘you’ are. If you are a talking ape, then that ape might be lying to itself. If you are a rationalist trapped in part of the brain of a talking ape, then you are just tricking another part of it’s brain, which is entirely rational.
I absolutely love that idea. But I think a clearer way of explaining it is that we are talking apes who have picked up this blunt, rotting bone of rationality and are using it as any other tool to pursue the same old talking ape desires. While the means are rational, the ends aren’t even close. Anyway, great point and lovely imagery!
Private Investigator? :-O