@Thomas,
Thomas wrote:Sure. In particular, preference utilitarianism falls apart if you take away the assumption that people prefer what they prefer. But I don't see how you can take that away from preference utilitarians without a contradiction in terms. So why should I worry about it?
I'm not sure I see your point. I agree that people prefer what they prefer, but, as you admitted, that doesn't provide very much in the way of explanation, so I'm not sure why you're reverting to it here.
Thomas wrote:Other things being equal, you should make it more likely that I get it because you wish people well.
No, decidedly not. Certainly you'd agree that people don't act altruistically in the market, where preferences are most pronounced. If you and I both prefer a certain good that cannot be shared, then not only do I not want you to get it, but I will do everything that I can to prevent you from getting it.
Compare that with the classical utilitarian's "happiness." I can wish you (and the rest of humanity) to be as happy as possible, because your happiness does not detract at all from mine. Happiness, therefore, can be a "common good" in a way that preferences cannot.
Thomas wrote:And I know you wish people well because you wouldn't deal in ethics of any kind otherwise. (Even Kantian ethics don't work entirely without goodwill and empathy.)
I'm not sure I'd agree with you there. An ethical system based on divine command, for example, can dispense entirely with sympathy for one's fellow humans. As long as I'm obeying God's/Allah's/Zeus's/FSM's commands, the rest of humanity can take a flying leap. And Ayn Rand would say that her ethical system was based solely on enlightened self-interest.*
Thomas wrote:Yes, something like that. We can truly say that he prefers one bundle (his family and a clean conscience) over the alternative (Katie Holmes and a life of guilt).
No, I disagree. While we can say that people prefer what they prefer, we can't say "people prefer whatever they end up doing." That makes "prefering" the same thing as "doing," which is clearly incorrect. Certainly, there are many instances where someone does something that he would prefer not to be doing. It would also mean that we always get what we want, which, I think, Mick Jaggar conclusively disproved.
*That's not to say that Rand's ethical system is defensible, or even coherent, but simply that it dispenses with any notions of sympathy.