Peterdjones comments on Conceptual Analysis and Moral Theory - Less Wrong
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That's very contestable. It has frequently argued here that preferences can be inferred from behaviour; it's also been argued that introspection (if that is what you mean by "subjectively") is not a reliable guide to motivation.
This is the whole demonstrated preference thing. I don't buy it myself, but that's a debate for another time. What I mean by subjectively is that I will value one person's life more than another person's life, or I could think that I want that $1,000,000 more than a rich person wants it, but that's just all in my head. To compare utility functions and work from demonstrated preference usually - not always - is a precursor to some kind of authoritarian scheme. I can't say there is anything like that coming, but it does set off some alarm bells. Anyway, this is not something I can substantiate right now.