If, instead, someone were to just say that they "believe" that moral facts don't exist, then it side-steps the issue. A means of objective evaluation is not necessary for it to be true that someone believes something. — Avery
That's why right after that I wrote "at most, the nihilist can express their opinion that nihilism is true, but to be consistent, must agree to disagree with anyone whose opinion differs about that".
That's why it's tantamount to just bowing out of moral discourse entirely. Other people are talking about moral issues and trying to figure out what is or isn't moral in this or that context, and you say you don't think anything is or isn't moral in any context. They ask why not, and you admit that you can't prove it, that it's just your opinion. So they shrug, state that it's not
their opinion, and go about as they were.
And I'm also going to need some evidence that floopblorp is real. — Avery
Moral questions aren't necessarily about what is or isn't real.
Some people think that moral answers have to be grounded in some kind of facts about reality, but you and I both already disagree with them. That doesn't make the
questions meaningless. It makes that kind of justification for answers a poor justification.
Do some people murder other people? I'm betting you'll say yes, 'cause they do.
Ought those people murder other people? I'm betting, as you say you're not a psychopath, that you'll say something to the effect of "no", except you'll try some circuitous way of rephrasing the "ought" question into an "is" question.
But there's no getting around that this is a fundamentally different kind of question than the first. They're both
about the same state of affairs: people murdering people. So why aren't they exactly the same question? Because one is asking whether that state of affairs is
real, whether it
is the case that some people murder other people, and the other is asking whether that state of affairs is
moral, whether it
ought to be the case that some people murder other people.
Asking whether something or another
ought to be the case isn't asking anything at all about whether or not anything
is the case; so likewise, a claim that something ought (or oughtn't) be the case, has no implications about what is (or isn't) the case. Saying "things ought to be this way" isn't making any claim at all about the way things
are, so asking for proof that something "is real" is a complete non-sequitur, because nobody was claiming anything was or wasn't real. They're not even trying to describe reality at all. People can do other things with words than describe the world.
If you just refuse to answer that kind of question, by always twisting every attempt to ask it into a different kind of question entirely, then you're... just refusing to answer that kind of question.
...is a straw man. It purports that moral nihilists are making one unprovable claim, and moral realists are making another unprovable claim. But that's not true. Realists are making one claim, and nihilists are saying that claim is unsubstantiated. — Avery
Saying it's unsubstantiated isn't nihilism, that's just skepticism. A particularly overzealous kind of skepticism that can't help but lead to nihilism, but still.
But also bear in mind that the same kind of overzealous skepticism could be applied to claims about reality. You just assume, like most normal mentally healthy people do, that something is objectively real, and you're not just dreaming the whole thing up. There's no way of proving one way or another that anything actually is or isn't objectively real, but you can't help but act as though you assume either one way or another. The same is true of claims about morality.
If you act as though your perceptions and beliefs might not be the correct ones, as though what seem to you to be other people have other perspectives on what is real, their own perceptions and beliefs, and that you could do to check your perspective against theirs and work out some description of what is the case that accounts for all of those perspectives without bias, then you're acting as though you think something is objectively real, in comparison to which it's possible for people's opinions to be wrong. If instead you walk about like your perception
just is reality (or equivalently, that nothing is real and your perception is all there is), and those who (seems to you to) disagree are just a meaningless figments of your own imagination, then you're acting like you don't think anything is objectively real. Would you do that, just because nobody can
prove conclusively that anything is objectively real?
If you act as though your desires and intentions might not be the correct ones, as though what seem to you to be other people have other perspectives on what is moral, their own desires and intentions, and that you could do to check your perspective against theirs and work out some prescription of what ought to be the case that accounts for all of those perspectives without bias, then you're acting as though you think something is objectively moral, in comparison to which it's possible for people's opinions to be wrong. If instead you walk about like your desire
just is morality (or equivalently, that nothing is moral and your desire is all there is), and those who (seems to you to) disagree are just a meaningless figments of your own imagination, then you're acting like you don't think anything is objectively moral. Should you do that, just because nobody can
prove conclusively that anything is objectively moral?
There is a healthier kind of skepticism about both reality and morality than this rejection of everything until it's proven from the ground up. Be skeptical of each particular claim, others' and your own; hold every opinion you hold only tentatively, being open to evidence to the contrary, and ready to change your mind if you should come across it. But in the mean time, hold
some opinion, whichever seems most plausible to you. And if you and someone else have different opinions -- about what is real or about what is moral -- try to gather all of your respective reasons for holding those opinions together and see if you can't figure out what possible opinion accounts for all of those reasons. You know, like reasonable people do.