By removing man’s consciousness from the metaphysical equation, which the metaphysical primary of Existence most certainly does, we remove the singular conscious Self from man. And the conscious Self is the means by which man is able to assert that he IS, and by this is able to say what he IS NOT—he is able to make the distinction between himself and his environment, and this is the fundamental definition of Reality, period. Any other definition, and any other reference, is utterly beyond him…he cannot possibly know it. Therefore, by removing consciousness from metaphysics, man’s ability to define his environment and himself is fundamentally removed. And this of course makes it impossible for him to claim any real epistemological understanding (truth from falsehood), and lacking epistemological understanding he necessarily lacks ethical understanding (good from evil), because epistemology and ethics are of course corollary. The metaphysical primary of Existence then ironically removes man from Existence, placing it utterly outside of him, beyond his consciousness, and thus beyond his categorical frame of reference. In which case, man can claim to apprehend no actual ethics, because ethics, like epistemology, are a function of metaphysics…the metaphysics of Existence. And this is the root of the claim that “universal ethics do not exist”. As far as man is concerned, ethics are impossible for him, because his consiousness, being utterly subjective, being exclusive of Existence, is exclusive of not only universal ethics but anything universal at all…be it ethics, or truth, or reality on the whole. Because universality in the philosophical sense, and in the practical sense, is simply another word for objectivity. So the claim “universal ethics do not exist” can be rendered—and more precisely rendered—“objective ethics do not exist”. From this we can follow the logical progression to the claim “objective ethical behavior does not exist”. And this being the case, the idea that it is possible for man to act in a “universally preferable” way is irrational and pointless. Without universal ethics, there can be no standard for universally preferable ethics, because to say that there are no universal ethics is really to say that there are no actual ethics at all. And there can be no such thing as a preference which is rooted in that which does not actually exist in the first place. It’s an infinitely subjective preference, in other words…which makes it merely an opinion, full stop…akin to having a favorite color.
Universally preferable behavior. Well…what is actually preferable? Nothing. Because universal ethical behavior—behavior which is right as opposed to that which is wrong—cannot objectively be defined; it isn’t a thing. Man’s consciousness is removed from reality; man’s consciousness, specifically his conscious Self, is his sole frame of reference for anything which is real and thus true and thus good. And as goes the reference so goes ethics. As goes ethics so goes behavior. As goes behavior, so goes preferential behavior.
Ethics doen’t exist because You qua You don’t exist, and so your behavior doesn’t exist, which means there is no behavior to be preferred. Universal or otherwise.
Holding onto fundamentally untenable and irrational metaphysics (like those of Existence) will lead one down the wrong ethical path all the time, every time.