I’m unconvinced that this ethical system can be derived as an imperative from our nature.
I would guess you are unconvinced because Objectivism’s ethical system is not “derived as an imperative” from our nature.
Ethical statements are not imperatives, they are normatives.
It sounds like you believe the purpose of ethics is to formulate imperatives, commandments, edicts, dictates, dogmas or orders, i.e., that ethics is a subject for restraining men, or reigning in their choices.
It sounds as though you have accepted some variant of the mind / body dichotomy.
Proper ethics is not found in imperatives, ordering or dictating how men should restrain themselves and/or resist temptations, or mortify the flesh.
Objective normative statements ask, given I am a certain kind of being, living in a certain kind of world, and I have no automatic means of knowing what to do, what actions am I to choose?
Ayn Rand, called ethics “hypothetical.” If we choose to live, then a certain course of action necessarily follows. And, if we choose to consider the full context of our nature as men, and the nature of the world around us, then further refinements of our choices necessarily follow.
But, if you take the Objectivist ethics as a system of imperatives, and then look for evidence supporting why one should choose to restrain one’s choices; choose to restrain one’s mind, and blindly follow those imperatives; you will never find an answer, because you are looking for a reason to support un-reason.
The quotes you started with are Ayn Rand stating she has discovered a metaphysical phenomena (when considered epistemologically, i.e., when conceptualized), which stops the potential infinite regress one would be trapped in if one concluded that values are just means to ends, which are means to other ends, etc. etc.
She discovered that the phenomenon of life, i.e., life by its nature, is an end in itself, i.e., that it is conditional in nature, i.e., it constantly requires maintenance, for it to remain in existence.
She notes: the term we have for those things which provide the necessary conditions for sustaining that existence as a living being, are known as “values;” in other words, when we conceptualize living beings, and what is continuously required for them to remain in existence; concepts such as value and need arise.
In Garry Hall’s course, “Ayn Rand’s Philosophic System,” he demonstrates this point with a “Plant, cat, table.” If you had a plant, cat and a table, and you go on a very long trip, leaving the three behind. If the cat is in a cage or strapped to the table, when you return you will find the table unaffected, but the plant and the cat dead. Why?
As living beings, the existence of the plant & the cat, is conditional, they have continuous requirements to remain in existence as living beings. The table is not living and its existence is not conditional in the way the living beings existence is.
Ayn Rand states, “The fact that a living entity is, determines what it ought to do.”
The concept of values or needs do not apply to non-living beings. One does not observe non-living beings acting in ways to sustain their existence. The absence of food or protection does not lead to their death. There is no need to pursue the necessary conditions for their further existence as non-living beings, because there are no necessary conditions for them to remain what they are.
But what a living being is by its nature as a living being, requires it to get what it needs, or else. If a living being does not get what it needs it ceases to “be” what it is: it ceases to be.
“The fact that a living being is,” means that a living being is what it is, i.e., that to be a living being is to face a constant alternative of needing to sustain its life with values, or else.
As men, we conceptualize this state of our own conditional existence. That is to say, when we realize we are members of this class of living beings, we formulate our own needs or requirements into words, because that’s how we as men sustain our lives. We express the problem of being alive by formulating statements containing “should” and “ought” words.
These statements, implicitly acknowledge this entire context, including the context of our own free will in the matter of what to do.
Again, she states “The fact that a living entity is, determines what it ought to do.” What is determined here? Neither man nor beast has any choice about the fact that their lives depend on sustaining their needs.
A man can choose not to sustain those needs and die, but he cannot wish those needs out of existence.
But, no man is born knowing what his needs are. No man is born knowing how to know what his needs are.
It is the purpose of philosophy/ethics to tell him, but it is still his responsibility to convince himself what is right and how to go about getting it; which is why no system of ethics, consisting of a set of imperatives could ever provide him with what he needs.
Regards,
Michael