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XiXiDu comments on What is Metaethics? - Less Wrong
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Due to your genetically hard-coded intuitions about appropriate behavior within groups of primates, your upbringing, cultural influences, rational knowledge about the virtues of truth-telling and preferences involving the well-being of other people, you feel obliged to influence the intercourse between Alice and Bob in a way that persuades Alice to do what you want, without feeling inappropriately influenced by you, by signaling your objection to certain behaviors as an appeal to the order of higher authority .
If you say, "I don't want you to strangle Alice.", Bob might reply, "I don't care what you want!".
If you say, "Strangling Alice might have detrimental effects on your other preferences.", Bob might reply, "I assign infinite utility to the death of Alice!" (which might very well be the case for humans in a temporary rage).
But if you say, "It is morally wrong to strangle Alice.", Bob might get confused and reply, "You are right, I don't want to be immoral!". Which is really a form of coercive persuasion. Since when you say, "It is morally wrong to strangle Alice.", you actually signal, "If you strangle Alice you will feel guilty.". It is a manipulative method that might make Bob say, "You are right, I don't want to be immoral!", when what he actually means is, "I don't want to feel guilty!".
Primates don't like to be readily controled by other primates. To get them to do what you want you have to make them believe that, for some non-obvious reason, they actually want to do it themselves.
This sounds like you are trying to explain-away the phenomenon, rather than explain it. At the very least, I would think, such a theory of morality needs to make some predictions or explain some distinctions. For example, what is it about the situation that causes me to try to influence Alice and Bob using moral arguments in these cases, whereas I use other methods of influence in other cases?
Complex influences, like your culture and upbringing.That's also why some people don't say that it is morally wrong to burn a paperback book while others are outraged by the thought. And those differences and similarities can be studied, among other fields, in terms of cultural anthropology and evolutionary psychology.
It needs a multidisciplinary approach to tackle such questions. But moral philosophy shouldn't be part of the solution because it is largely mistaken about cause and effect. Morality is an effect of our societal and cultural evolution, shaped by our genetically predisposition as primates living in groups. In this sense moral philosophy is a meme that is part of a larger effect and therefore can't be part of a reductionist explanation of itself. The underlying causes of cultural norms and our use of language can be explained by social and behavioural sciences, applied mathematics like game theory, computer science and linguistics.
Guilt works here, for example. (But XiXiDu covered that.) Social pressure also. Veiled threat and warning, too. Signaling your virtue to others as well. Moral arguments are so handy that they accomplish all of these in one blow.
ETA: I'm not suggesting that you in particular are trying to guilt trip people, pressure them, threaten them, or signal. I'm saying that those are all possible explanations as to why someone might prefer to couch their arguments in moral terms: it is more persuasive (as Dark Arts) in certain cases. Though I reject moralist language if we are trying to have a clear discussion and get at the truth, I am not against using Dark Arts to convince Bob not to strangle Alice.
Perplexed wrote earlier:
Sometimes you'll want to explain why your punishment of others is justified. If you don't want to engage Perplexed's "moral realism", then either you don't think there's anything universal enough (for humans, or in general) in it to be of explanatory use in the judgments people actually make, or you don't think it's a productive system for manufacturing (disingenuous yet generally persuasive) explanations that will sometimes excuse you.
Assuming I haven't totally lost track of context here, I think I am saying that moral language works for persuasion (partially as Dark Arts), but is not really suitable for intellectual discourse.
Okay. Whatever he hopes is real (but you think is only confused), will allow you to form persuasive arguments to similar people. So it's still worth talking about.