Evolution of morality

[corndog36]

The applicable definition of "moral", I believe, is: Doing what is right, just or fair. (I'm open to other interpretations.)

None of those three principles (right, just and fair) are objective.

Depending on how you define those terms they can be.

I think you have to agree on definitions of terms, in order to have any meaningful discussion beyond semantics. I'm defining morality as "treating everyone equally" because that is what is "fair", and what is fair is "just", and what is just is "right". It is simplistic but conforms to common usages of terms.

The very idea of a fundamental principle of morality is logically circular.
You want to build a moral code based on a fundamental principle, but that fundamental principle has to be defined by your moral code.

Rather than "moral code" I should have said "code of conduct", to avoid confusion. The code of conduct would be based on the fundamental principle. But the question for me is; is it possible to identify a fundamental principle of morality? I'm not yet convinced that it is not.

Using my earlier example: "All human beings have the right to peacefully co-exist," as a starting point. Can anyone refute that that is a (or possibly "the") fundamental principle of morality?