Either we are forces as a species to define our morality based off of something, or to revert to our evolutionary instincts; fundamentally survival of the fittest.
I disagree with you. Species of high intelligence court different rules than those of the norm.
To make a long argument short...
Human selection extends far past simply that of the natural environment.
Empathy is an example of an evolutionary trait which manifests within consciousness (as opposed to physical traits). It is likely that morality, although subjective, is derived primarily from empathy (the ability to share emotions).
Empathy is an important group survival instinct.
Families and extended families tended to form tribal units in our early hunter-gatherer evolutionary stages. Then, with the advent of agriculture, families formed townships and villages.
So, while you may have a moral and empathetic obligation to provide a needy person with medical attention, you have a much stronger and more hardwired obligation/requirement to provide a member of your own family with medical attention.
Natural selection and morality are not mutually exclusive if you recognize that humans form families (and groups of families) and these collective units tend to be subject to evolution in their own way. Thus theft, murder and slavery within a group, or set of groups, ends up being detrimental to the survival of the whole.
On a side note; It is interesting how perverted our own society has become. We have moved a long way toward fascism, from freedom. The individual is largely cut off from his family, and the family from their larger township group. As government absorbs more of the responsibilities of parenthood the children cease to be those of the biological parents and increasingly become children of the state. Much of the common knowledge from just two generations ago has been lost due to the advent of public schools and full time employment.
Multi-disciplined learning is becoming largely extinct. People are unaware of how the world around them operates, only focusing on the tasks and procedures they have been taught and that they need for their work.
This puts us in a dangerous position. Cut off from our natural form and increasingly compartmentalized and dumbed down. Are we so different from the bovine in their field? Divorced from their natural environment, ear tagged, and divided into paddocks and farms (and ultimately industry) based on their traits.
