I have background knowledge in philosophy but I now live in a place where I have discovered no source of any remote answer to the question about ethics which I formulate below. (Honestly).
Three propositions follow:
(1) Male cardinals are red
(2) Hamburgers are delicious
(3) Lying is wrong
Consider (1) first. To dogs, the color blind, the blind simpliciter, or bees, male cardinals just aren't red. Male cardinals are not red in the same sense that there are 12 ounces of Budweiser in that can. My claim here is that it is actually FALSE that male cardinals are red. What's really true is that we PERCEIVE male cardinals to be red, and others do not. The same can clearly be said about (2), since hamburgers probably taste awful to vegetarian species. I see no reason why we can't similarly say that (3) is 'subjective' as well in that lying is only wrong because we experience the feeling that lying is wrong.
Ethical theories like utilitarianism, deontology, divine command theory, etc. don't really move us past our ethical perceptions because they are simply flawed attempts to generalize them. Utilitarians might say that lying is usually wrong because it decreases overall utility (pleasure), but that's similar to saying that hamburgers taste delicious because they have a high fat and cholesterol content. The question can continuously be levied, 'Why is THAT (a decrease in utility) wrong?' I think the answer is always finally that we just feel that way.
So it is false that lying is wrong, and it is also false that lying is right, just as cardinals are neither red nor gray. It is simply true that various individuals perceive cardinals and killing in various ways. But nothing additional follows from the fact that I or any number of people perceive things in a certain way; at one point people perceived the world to be flat, but that's not the way things are. Therefore, I hereby (with tongue in cheek) brashly declare all moral judgements on this site and elsewhere false! Aren't I correct?
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