The distinction between a watch and a person is valid. A watch is supposed to mark the time because a watch is nothing besides something which marks the time. Mo is right that when a watch is broken and it is used as a bookmark, it is no longer a watch but a bookmark. Its function is what it is.
Man is different. Unless you can define what a man is ‘meant to be’, you can not derive an “ought”.
Since philosophy is part of man, it’s going to be pretty difficult defining the “is” of man in such terms that an “ought” follows from it or reflects it.
Morality is precisely this attempt. Moralities try to define man as a utensil. “Man is the creation of God and ought to do Gods will”.
This discussion has avoided the central issue of morality, which is a collective interest in the individual.
True individualism only came to be with the advent of nihilism, when man could no longer believe that he was meant to do anything at all, and started to think that his “is” could mean anything - thus that it factually means nothing.
RM is attempting to define man as a coherent “is”, from which an “ought” follows - namely, man ought to do that which perpetuates his “is”. Man is a self-harmony, which must accumulate momentum by verifying its hopes and threats.
Value Ontology proposes that man is a self-valuing and thus, that all his oughts follow from whichever way he values himself.
He ought to breathe, in order to keep existing. But he doesn’t need to keep existing.
MM is right that there can be no ontological difference between is and ought, but I don’t think that this makes for a simple solution.
When the army values a man in terms of his force and controllability, this man ought to do his superiors bidding, which is to be a soldier, to fight under command. This is morality. The considerations that go through the head of the man are not. Morality is what you’re being told to do, it’s telling you what you ought to be. That’s what it has always meant. Now that people begin to think that they can perhaps define what they are for themselves, morality is no longer applicable.
Hume’s problem, along with what dominates the disagreement in this thread, is that the “is” is taken for granted.
I’ve long ago abandoned the concept “human” as the behavioral differences between two humans age far greater than the differences between an average human and an average chimp. Human is not a valid category of “is”, thus there is a great space for one human to tell another human what he ought to be.
Humans are clay, this is generally true. Can I conclude then that they ought to be molded?
No. I prefer to say that they ought to not be clay. Thus that their “ought” is diametrically opposed to their “is”.
And that is precisely the original of morality - to improve what is into what ought to be.
The very beginning of morality: A child is a helpless bundle of organic material. It ought to become a self-sustaining organism. That possibility is not implicit in its “is”. It is wholly forced upon it by a collective of which it is part. Thus, a mans “is” is derived from his “ought”, not the other way around.
Man survives his infancy only because someone else values his existence. He is embedded in an “ought” in order that he may be an “is”, and become aware of that. Thus nihilism is logically untenable, and only an extension of the Oedipus complex.