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RichardKennaway comments on Morality is not about willpower - Less Wrong
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You say "again", but in the cited link it's called the "Texas Sharpshooter Utility Function". The word "fallacy" does not appear. If you're going to claim there's a fallacy here, you should support that statement. Where's the fallacy?
The original claim was that human behavior does not conform to optimizing a utility function, and I offered the trivial counterexample. You're talking like you disagree with me, but you aren't actually doing so.
If the only goal is to predict human behavior, you can probably do it better without using a utility function. If the goal is to help someone get what they want, so far as I can tell you have to model them as though they want something, and unless there's something relevant in that Wikipedia article about the Allais paradox that I don't understand yet, that requires modeling them as though they have a utility function.
You'll surely want a prior distribution over utility functions. Since they are computable functions, the usual Universal Prior works fine here, so far as I can tell. With this prior, TSUF-like utility functions aren't going to dominate the set of utility functions consistent with the person's behavior, but mentioning them makes it obvious that the set is not empty.
How do you know this? If that's true, it can only be true by being a mathematical theorem, which will require defining mathematically what makes a UF a TSUF. I expect this is possible, but I'll have to think about it.
No, it's true in the same sense that the statement "I have hands" is true. That is, it's an informal empirical statement about the world. People can be vaguely understood as having purposeful behavior. When you put them in strange situations, this breaks down a bit and if you wish to understand them as having purposeful behavior you have to contrive the utility function a bit, but for the most part people do things for a comprehensible purpose. If TSUF's were the simplest utility functions that described humans, then human behavior would be random, which is isn't. Thus the simplest utility functions that describe humans aren't going to be TSUF-like.