Suffice it to say that something's being in our DNA is neither sufficient nor necessary for it to be moral.

Agreed - but what IS sufficient and necessary?

'Moral' is just a word. It's a pointer we used to refer to a concept without having to transfer the whole thing every time we wish to communicate about it. What is the concept the word points to? You have to be able to answer that question before you can pose any further questions. Without knowing that, you can't speak intelligently about the concept at all.