all neurologically healthy people would agree about the latter if they thought about it clearly enough
This is what you are missing. The simple fact that someone disagrees does not mean they are mentally sick or have fundamentally different value systems. It could equally well mean that either they or the “prevailing social mores” are simply mistaken. People have been known to claim that 51 is a prime number, and not because they actually disagree about what makes a number prime, but just because they were confused at the time.
It’s not reasonable to take people’s claims that “by ‘should’ I mean that X maximises utility for everyone” or “by ‘should’ I mean that I want X” at face value, because people don’t have access to or actually use logical definitions of the everyday words they use, they “know it when they see it” instead.
No, I don’t think I’m missing this piece. The claim is very general: ALL “neurologically healthy people”.
People can certainly be mistaken about matters of fact. So what?
It’s not reasonable to take people’s claims that “by ‘should’ I mean that X maximises utility for everyone”
Of course not, the great majority of people are not utilitarians and have no interest in maximizing utility for everyone. In normal speech “should” doesn’t mean anything like that.
This is what you are missing. The simple fact that someone disagrees does not mean they are mentally sick or have fundamentally different value systems. It could equally well mean that either they or the “prevailing social mores” are simply mistaken. People have been known to claim that 51 is a prime number, and not because they actually disagree about what makes a number prime, but just because they were confused at the time.
It’s not reasonable to take people’s claims that “by ‘should’ I mean that X maximises utility for everyone” or “by ‘should’ I mean that I want X” at face value, because people don’t have access to or actually use logical definitions of the everyday words they use, they “know it when they see it” instead.
No, I don’t think I’m missing this piece. The claim is very general: ALL “neurologically healthy people”.
People can certainly be mistaken about matters of fact. So what?
Of course not, the great majority of people are not utilitarians and have no interest in maximizing utility for everyone. In normal speech “should” doesn’t mean anything like that.