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gordianus's avatar

> Most anti-realists agree that if there are irrational desires, moral realism is true. This is true because morality is about what we have impartial reason to do, and impartiality is clearly coherent, so as long as there are desire independent reasons to do certain things and care about other things, moral realism is true.

I haven't read the Parfit book you cite, but this seems incomplete: some desires are irrational because they make it more difficult to do things that you desire more. For instance, if you want just about anything in life, also desiring to kill yourself would be irrational, both because having that desire makes it more likely that you'll act on it, & because (for most humans) having that desire is unpleasant, which is also undesirable. Or, to take a less extreme example, if you want to remain healthy, it is irrational to also want to eat lots of unhealthy food. However, if we exclude this exception, this argument seems correct.

> Here are a bunch of desires that aren’t irrational if anti-realism is true,

Most of these hypotheticals are desires that a human is very unlikely to have (e.g., wanting to eat a car, being indifferent to any amount of pain felt on Tuesdays), but that doesn't mean that it's impossible for any sort of mind to have these desires & be rational in pursuing them. (Likewise, destroying the Earth to turn it into paperclips is obviously irrational to a human, but that doesn't mean that a badly designed AI couldn't have desires that would make this action rational for it.) 4 & 7 are just illustrations of the fact that, for someone who discounts the future highly, acting rationally in the present often makes it harder to get what one will want in the future.

The criticism of noncognitivism you describe seems correct. However, if you think "that moral values are too odd to be part of the fabric of reality" (as I do, since as far as I know there is no evidence that morality is "part of the fabric of reality"), then the only possible conclusion is that there is no morality independent of people's conceptions of morality. Since people do not agree on morality, different people's or societies' ideas of morality must vary; therefore, to say that something is moral or immoral makes sense only within a particular moral worldview. Given this context, most of your supposed counterexamples to subjectivism seem reasonable; e.g., Nazi Germany acted morally by its standards but immorally by our standards. The only exceptions are "Some societal practices are immoral" (most societies have some practices that are immoral by their own standards; e.g., scams & racial stereotyping in modern American society) & "when I say “we should be utilitarians,” and Kant says “we shouldn’t be utilitarians,” we’re not actually disagreeing" (since these quotes clearly refer to objective & not subjective morality).

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Lance S. Bush's avatar

Is there a way of changing the commenting methods on your posts? It looks like you want to discontinue our exchange but in large part that could be because there's no good way of quoting people (at least that I'm aware of) to make for a clean and orderly discussion. But I'd like to have a written exchange, since that provides a different medium for conveying our ideas than just speaking.

Personally, for instance, I'm still very curious what you take the implications of moral relativism to be. I don't think relativism has *any* troubling implications, so I don't think people could be appropriately dissuaded from relativism by its alleged "implications."

If you really don't want to have this exchange here...which is a bit weird (since what else is a comment section for?) that's your prerogative, but if so, as you suggest, let's do another video chat. Either way I'd like these exchanges to made available to others!

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