It's hard to give an all-purpose answer. But notice: the way you've posed the problem suggests that if cloning does more harm than good, it would be morally acceptable. People who think right and wrong are a matter of consequences would agree; people with a different way of thinking about right and wrong might not. Someone might argue, for instance, that trying to make copies of people shows a fundamental lack of respect for the humanity of the beings who result -- doesn't treat them as "ends in themselves." I'm not sure that would be a convincing argument, but it's easy to imagine it being made. As to whether cloning people might have net benefits, the answer surely is that it would depend on a lot of other things, which is one reason why it's hard to give a blanket answer to your question.
Is there any credence to the idea that acting morally works in evolutionary terms, i.e., that it helps preserve the unity and survival of a co-dependent group?
If this is the case, surely talk of absolute morality derived from religious scriptures is worthless, and our morality is just a refined survival technique.
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It may well be that there's an evolutionary story to be told about how we come to adopt moral codes and so on. But your question, as I'm reading it, is whether this undermines the objectivity of morality -- leads to the conclusion that our moral views are neither correct nor incorrect, or something like that. In fact, the two issues seem quite distinct. Compare: No doubt our ability to sort things by shape evolved and helps us survive. But that doesn't mean things don't really have shapes, nor that our beliefs about shapes are somehow flawed or empty or merely a "refined survival technique." There's a third strand to be separated out here. If there is such a thing as objective morality, what makes it objective isn't the fact that it's to be found in some scripture or other. On the one hand, none of us needs scripture to be convinced that wanton cruelty is wrong. And on the other hand, some things called for in some scriptures don't seem right on reflection at all. To sum up, what evolution...
Human beings have evolved similar physical attributes over time. Though there is some genetic variation among individuals, we share many traits. But isn't it also possible that, as a result of our common evolutionary heritage, we share similar emotional and moral traits as well? If we all have basically similar emotional machinery, why couldn't we appeal to the general constellation of desires that most of us share, and use them to construct a universal ethics? If the good is what makes us happy, and happiness is the fulfillment of various desires, and if humans have similar desires because we share evolved mental traits, then why couldn't an appeal to those traits in the search for moral agreement?
Just as medical experts can give general advice about physical health because most humans share similar physical bodies, why can't psychologists and ethicists give general advice about morality based upon our shared mental traits?
We do have a lot in common psychologically, and all of that matters when we're trying to decide what's right and wrong. And the more we know about the psychological effects of how we treat people, the more information we'll have to feed into our ethical decisions. Psychologists have relevant things to say, as do doctors and, for that matter, economists, massage therapists, and various other specialists. Whether or not knowing everything about what makes people happy would settle all ethical questions, however, is another matter. (Not sure if you were suggesting it would.) For example: suppose that there are things that would make me happy at your expense. Most of us don't think it's just a matter of comparing the sum of my potential pleasure to the sum of your potential pain. Questions about fairness, for example, will also matter, and psychologists have no special expertise in sorting out what's fair. (Neither do most philosophers, for that matter.) There's also room to argue about...