In which case, you will be making a point—not that there are different facts, but that there are different languages. Of course, language is an invention—and there is no natural law that dictates the definition of the word “astronomy”.
It is merely a convention that we have adopted a language in which the term “astronomy” does not cover chemical facts. But we could have selected a different language—and there is no law of nature dictating that we could not.
And, yet, these facts about language—these facts about the ways we define our terms—does not cause science to fall to its knees either.
So, what are you talking about? Are you talking about morality, or are you talking about “morality”?
Here is the general form of my argument.
A person says, “X” is true of morality or of “moral judgments” in the public at large. This brings the talk of an objective morality to its knees. I answer that X is also true if science “or of “truth judgments” in the public at large. But it does not bring all talk of objectivity n science to its knees. Therefore, the original argument is invalid.
A case in point: whether somethis is moral depends on your definition of moral. But there is no objective way to determine the correct definition of “moral”. Therefore, there is no chance of an objective morality.
Well, whether Pluto is a planet depends on your definition of “planet”. There is no way todetermine an onjectively correct definition of “planet”. Yet, planetology remains a science.
Yes, many moral judgments are projections of an individual’s likes and dislikestreated as intrinsic properties. But, then, many of their perceptions and observations are theory-laden. This does not eliminate the possibility of objectivity in science. We simply incorporate these facts about our perceptions into our objective account.
The original post to which I responded did not provide a helpful definition. Defining “subjective” as “mind independent” denies the fact that minds are a part of the real world, and we can make objectively true and false claims about minds. Values may not exist without minds, but minds are real. They are a part of the world. And so are values.
Every “subjective” claim has an “objective” claim that says exactly the same thing.