But... the more profound question is why is there a recognition of "wrong" or "right"?
C.S. Lewis said it best:
"...Each man is at every moment subjected to several different sets of law but there is only one of these which he is free to disobey As a body, he is subjected to gravitation and cannot disobey it; As an organism, he is subjected to various biological laws which he cannot disobey any more than an animal can. That is, he cannot disobey those laws which he shares with other things; but the law which is peculiar to his human nature, the law he does not share with animals or vegetables or inorganic things, is the one he can disobey if he chooses.
This law was called the "Law of Nature"... because people thought that every one knew it by nature and did not need to be taught it.
Whenever you find a man who says he does not believe in a real Right and Wrong, you will find the same man going back on this a moment later. He may break his promise to you, but if you try breaking one to him he will be complaining 'It's not fair' before you can say Jack Robinson...
It seems, then, we are forced to believe in a real Right and Wrong. People may be sometimes mistaken about them, just as people sometimes get their sums wrong; but they are not a matter of mere taste and opinion any more than the multiplication table... If we do not believe in decent behaviour, why should we be so anxious to make excuses for not having behaved decently. The truth is, we believe in decency so much - we feel the Rule of Law pressing on us so - that we cannot bear to face the fact that we are breaking it, and consequently we try to shift the responsibility...
Consequently, this Rule of Right and Wrong, or Law of Human Nature, or whatever you call it, must somehow or other be a real thing – a thing that’s really there, not made up by ourselves..." (C.S. Lewis, "Mere Christianity")
Mr. Lewis goes on to say (I paraphrase) One cannot describe a crooked road unless he and the receiver of the description first have a notion of a straight road? Why does everyone know what a straight road is?
The questions are as valid today as in the 1930's and 1940's of Mr. Lewis time...