Peter Holmes wrote: ↑March 16th, 2020, 2:11 am
I think your explanation is incorrect. We're talking about the nature and function of assertions, which, of course, aren't themselves opinions. Here are the examples.
#1 Paris is the capital of France.
#2 In my opinion, Paris is the capital of France.
#3 Paris is beautiful.
You say that all of these express opinions - because all assertions of any kind express opinions.
Yes, they do, although prefacing #2 with, "It is my opinion that . . ." would be redundant.
But the function of #1 is not to express the opinion that Paris is the capital of France. Its function is to make a factual claim with a truth-value.
Yes, it is. But whenever that proposition is asserted it also expresses the opinion of the speaker. It is not the
function of #1 to express an opinion, but it nevertheless expresses one. Whenever it is asserted, someone can truthfully say, "That is your opinion."
And because its truth-value is independent from opinion, the assertion is objective. Your appeal to 'public truth conditions' - though it's a correspondence-theory mistake - also assumes independence from opinion.
Yes, the truth values of all propositions are "independent of opinion," in the sense that no one's opinions affect their truth values (except for propositions asserting something about someone's opinion). "All propositions" there, BTW, includes
subjective propositions. See below.
#2 may express hesitation or uncertainty as to the truth of the embedded factual assertion. But it doesn't express the opinion that, in 'my' opinion, Paris is the capital of France. That's an absurd analysis of the function of #2.
Not absurd, but redundant and awkward.
But #3 does genuinely express an opinion, judgement or belief - aesthetic, in this case. Its function is not to make a factual claim with a truth-value independent from opinion. And the function of the moral assertion 'slavery is wrong' is identical: to express an opinion.
Suppose we had a set of criteria of beauty accepted by all members of some speech community, such that anything X satisfying one (or some other number) of them would qualify them as "beautiful," and that determining whether X did or did not satisfy the criteria was empirical. Then "Paris is beautiful" would be objective; it would be a factual claim. Of course, there is no such set of agreed upon criteria --- no public truth conditions --- so the proposition, "Paris is beautiful" is subjective. But calling that proposition an "opinion," and "Paris is the capital of France" "factual" does not get to the real difference between them. The latter statement is also the opinion of the person asserting it. "Fact" and "opinion"
are not contraries.
Furthermore, "Paris is beautiful"
is a "factual" claim. It has a truth value --- it is true if the city somehow satisfies the speaker's criteria of beauty. But those criteria are not public, and hence the proposition is subjective. Suppose you have a headache and declare, "I have a headache." Does that proposition have no truth value? Of course it does. But since its truth conditions are private, it is subjective.