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Eugine_Nier comments on Morality is not about willpower - Less Wrong
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If you think that's relevant, you should also go write the same comment on Eliezer's post on utilons and fuzzies. Having two coherent, consistent utility functions is no more realistic than having one.
If you want to be rational, you need to try to figure out what your values are, and what your utility function is. Humans don't act consistently. Whether their preferences can be described by a utility function is a more subtle question whose answer is unknown. But in either case, in order to be more rational, you need to be able to approximate your preferences with a utility function.
You can alternately describe this as the place where the part of your utility function that you call your far self, and the part of your utility function that you call your near self, sum to zero and provide no net information on what to do. You can choose to describe the resultant emotional confusion as "fighting for willpower". But this leads to the erroneous conclusions I described under the "ethics as willpower" section.
He never said these "utility functions" are coherent. In fact a large part of the problem is that the "fuzzies" utility function is extremely incoherent.
You keep using that word. I do not think it means what you think it means. A utility function that is incoherent is not a utility function.
If it is acceptable for Eliezer to talk about having two utility functions, one that measures utilons and one that measures fuzzies, then it is equally acceptable to talk about having a single utility function, with respect to the question of whether humans are capable of having utility functions.
I was using the same not-quite strict definition of "utility function" that you seemed to be using in your post. In any case, I don't believe Eliezer ever called fuzzies a utility function.