I think a true debate in ethics should produce, not necessarily only one model, but various.  Models that compliment one another and don’t have internal contradictions, don’t contradict each other, and don't contradict experience.
Self interest is the same as the interest of the species, if it wasn't we would not be here. The task is to find ways that our fears don't distort our sense of self interest.


Here is a model of "Creative Ethics", that utilizes a concept of
SAPIENCE that seeks to refer to "our totality" qua "sapient species"
and the totality of an individual, as well as to our most universally
held concepts of ideal realization on a human. In other words, it is the sum of the proper elements of humanity.

Definitions:
Proper elements:
The elements that, through creativity, take us to expand as individuals and as species to ever more dimensions of reality, (the total environment).

SAPIENCE: The summation of:
LOVE, WISDOM, MORALITY, and CREATIVITY. 
The ethics of Sapience, or "Creative Ethics" Propose that:
The goal that consciously or subconsciously has taken humanity to
the point it is now, in spite of other goals, is, and has been so
since the beginning: "The maximization of Sapience".

That:
The acceptance that the best one can do for oneself and for humanity is
to: "seek to maximize one's own and everybody's Sapience”, is a 
necessary and sufficient element to develop viable personal and social ethics. Ethics that are not relative (meaning that the ethics do not depend on particular cultures but are applicable in any society, primitive or highly advanced).
Creative  Ethics              The Ethics of Sapience
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