Document comments on Rationality quotes January 2012 - Less Wrong
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The preference alone is mostly harmless. When the preference is combined with the misapprehension that the preference can be fulfilled, it may harm the person asserting the preference if it leads them to make a bad choice between a meowing cat, a barking dog, or delaying the purchase of a pet.
If the preference order were (1. Barking Cat, 2. Barking Dog, 3. Meowing Cat, 4. No Pet), then the belief that a cat could be taught to bark could lead to the purchase/adoption of a meowing cat instead of the (preferred) barking dog.
Likewise, in the above preference order, or with 2 and 3 reversed, the belief in barking cats could also lead to the person delaying the selection of a pet due to the hope that a continued search would turn up a barking cat.
The problem is magnified, and more failure modes added, when we consider cases of group decision-making.
That's strictly ruled out by the wording in the quote. While people often miscommunicate their preferences, I don't see particular evidence of it there, or even that the hypothetical person is under a misapprehension.
To take it back to metaphor: the flip side of wishful thinking is the sour grapes fallacy, and while the quote doesn't explicitly commit it, without context it's close enough to put me moderately on guard.
Here is the full article from which the quote was taken: http://www.johnlatour.com/barking_cats.htm