You speak of nature vs nurture as a means of creating functional species or element of our world, but isn't that itself looking not at shades of grey, but at black and white composition. This view is part of the false dichotomy of evil/good, because this particular dichotomy exists because we observe other things as you say, as a mixture of nature and nurture that break the law somehow to make unlawful progress or advancement and not as simply nature or simply nurture that commits good or evil acts. But the thing is that evil and good, nature and reward or other dichotomies are as you say intertwined within us, but we are conscious of it, so our simplified thinking is not false dichotomies in which we blindly believe, but the lack of knowledge on how to act when we reach unknown areas that are not part of our routine and daily life. To us humans, good is a product of intertwined nature and nurture that is routinized and evil is product of nature and nurture that is not routinized. I think that we must not abandon simplified thinking which in a way gives us formal security, but accept the chaos outside of this formality and not be afraid of results that will at first seem as something foreign even to nature/nurture dichotomy. We should have attitude of looking at nature itself as something that is still in progress of being built, rather than as walls that surround us from the breeze of the unknown.
-Rust Cohle lol