In response to a request, I am going to do some basic unpacking of second-order desire, or "metawanting". Basically, a second-order desire or metawant is a desire about a first-order desire.
Example 1: Suppose I am very sleepy, but I want to be alert. My desire to be alert is first-order. Suppose also that there is a can of Mountain Dew handy. I know that Mountain Dew contains caffeine and that caffeine will make me alert. However, I also know that I hate Mountain Dew1. I do not want the Mountain Dew, because I know it is gross. But it would be very convenient for me if I liked Mountain Dew: then I could drink it, and I could get the useful effects of the caffeine, and satisfy my desire for alertness. So I have the following instrumental belief: wanting to drink that can of Mountain Dew would let me be alert. Generally, barring other considerations, I want things that would get me other things I want - I want a job because I want money, I want money because I can use it to buy chocolate, I want chocolate because I can use it to produce pleasant taste sensations, and I just plain want pleasant taste sensations. So, because alertness is something I want, and wanting Mountain Dew would let me get it, I want to want the Mountain Dew.
This example demonstrates a case of a second-order desire about a first-order desire that would be instrumentally useful. But it's also possible to have second-order desires about first-order desires that one simply does or doesn't care to have.
Example 2: Suppose Mimi the Heroin Addict, living up to her unfortunate name, is a heroin addict. Obviously, as a heroin addict, she spends a lot of her time wanting heroin. But this desire is upsetting to her. She wants not to want heroin, and may take actions to stop herself from wanting heroin, such as going through rehab.
One thing that is often said is that what first-order desires you "endorse" on the second level are the ones that are your most true self. This seems like an appealing notion in Mimi's case; I would not want to say that at her heart she just wants heroin and that's an intrinsic, important part of her. But it's not always the case that the second-order desire is the one we most want to identify with the person who has it:
Example 3: Suppose Larry the Closet Homosexual, goodness only knows why his mother would name him that, is a closet homosexual. He has been brought up to believe that homosexuality is gross and wrong. As such, his first-order desire to exchange sexual favors with his friend Ted the Next-Door Neighbor is repulsive to him when he notices it, and he wants desperately not to have this desire.
In this case, I think we're tempted to say that poor Larry is a gay guy who's had an alien second-order desire attached to him via his upbringing, not a natural homophobe whose first-order desires are insidiously eroding his real personality.
A less depressing example to round out the set:
Example 4: Suppose Olivia the Overcoming Bias Reader, whose very prescient mother predicted she would visit this site, is convinced on by Eliezer's arguments about one-boxing in Newcomb's Problem. However, she's pretty sure that if Omega really turned up, boxes in hand, she would want to take both of them. She thinks this reflects an irrationality of hers. She wants to want to one-box.
1Carbonated beverages make my mouth hurt. I have developed a more generalized aversion to them after repeatedly trying to develop a taste for them and experiencing pain every time.
I'd say it's misleading to say we thought the other person was "wrong," since in this context "wrong" is a word usually used to describe a situation where someone is in objective moral error. It might be better to say: "c1 and c2 are, objectively, equally morally good, but we each prefer a different one for arbitrary, non-moral reasons."
This doesn't change your argument in any way, I just think it's good to have the language clear to avoid accidentally letting in any connotations that don't belong.
This is not something I have done a lot of thinking on since the odds of ever encountering such a situation are quite low at the present. It seems to me, however, that if you are this fair to your opponent, and care this much about finding out the honest truth, that you probably care at least somewhat about morality.
(This brings up an interesting question, which is: might there be some "semi-sociopathic" humans who care about morality, but incrementally, not categorically? That is, if one of these people was rational, fully informed, lacking in self deception, and lacked akrasia, they would devote maybe 70% of their time and effort to morality and 30% to other things? Such a person, if compelled to be honest, might admit that c2 is morally worse than c1, but they don't care because they've used up their 70% of moral effort for the day. It doesn't seem totally implausible that such people might exist, but maybe I'm missing something about how moral psychology works, maybe it doesn't work unless it's all or nothing.)
As for determining if your opponent care about morality, you might look to see if they exhibit any of the signs of sociopathy. You might search their arguments for signs of anti-epistemology, or plain moral errors. If you don't notice any of these things, you might assign a higher probability to prediction that your disagreement is to preferring different forms of pluralism
Of course, in real life perfectly informed, rational humans who lack self deception, akrasia, and so on do not exist. So you should probably assign a much, much, much higher probability to one of those things causing your disagreement.
OK. In which case I can also phrase my question as, when I choose c1 over c2, how can I tell whether I'm making that choice for objective moral reasons, as opposed to making that choice for arbitrary non-moral reasons?
You're right that it doesn't really change the argument, I'm just trying to establish some common language so we can communicate clearly.
For my own part, I agree with you that ignoran... (read more)