Morals, to me, at least just come from social conditioning. If you were raised in a culture where it was normal to kill left handed people and you never heard anything different, then that is your moral truth right there. You would firmly believe that it was the correct thing to do.
In this worldview, morals are but an illusion; there would be no "good" or "evil" acts and one could not deem an act as "moral" or "immoral," "good" or "evil" and maintain a consistent worldview. Morals become completely arbitrary. Actions lose all moral dimension; no action would be either prohibited or obligatory. No moral difference would exist under this worldview between genocide and charity. Moral accountability would be as absurd as condemning or punishing someone for their preference in color.
It must be stressed that in an atheistic worldview, this (moral relativism; absurdism)
is the only logical conclusion one can arrive at. In other words, if you are an atheist, moral relativism
is logically concise with your worldview (we mustn't portray the atheist as a villain when in comes to morality but rather as the only logical outcome of the worldview he posses). That isn't the problem, though. The problem is that you
do, in fact, assert moral relativism yet then go ahead and make moral claims on what is and isn't "moral" or "good" or "evil" when such words are meaningless in moral relativism.
If atheism is true, then life is really objectively meaningless, valueless, and purposeless, despite our subjective beliefs to the contrary. I'm not saying that atheists have no goals or purpose for living. On the contrary, life would be unbearable and unlivable without such beliefs. But given atheism, these beliefs are all subjective illusions. They are mere appearance of meaning, value, and purpose, even though, objectively speaking, there isn't any. There is no reason to
not live a life of self-interest; living such a life would actually ultimately prove to be a smart decision.
In a world without objective moral values, who's to say whose values are right and whose are wrong? There can be no objective right or wrong, only our culturally and personally relative, subjective judgments. Think of what that entails! It means it's impossible to condemn war, oppression, or crime as evil. It becomes impossible to praise generosity and love as good.
Somebody might say that it's in our self-interest to adopt a moral lifestyle. You scratch my back, I'll scratch yours. But obviously, that's certainly not always true. We all know situations in which self-interest runs smack in the face of morality. We end up being confronted, in Jean-Paul Sartre's words "the bare, valueless fact of existence." Moral values are either just expressions of personal taste or byproducts of biological evolution and social conditioning.
And the true irony here is that many of you say that there is no evil, no good - nothing but pitiless indifference - many of you are unbashed moralists; You vigorously condemn harassment of homosexuals, indoctrination of children by religions, murder, etc.
"There is at the bottom no design, no purpose, no evil, no good, nothing but pointless indifference... We are machines for propagating DNA. It is every living object's sole reason for being." - Richard Dawkins
"There is no objective reason why man should be moral, unless morality 'pays off' in his social life or makes him 'feel good.' There is no objective reason why man should do anything save for the pleasure it affords him." - Stewart C. Easton
"Have you not heard of that madman who lit a lantern in the bright morning hours, ran to the market place, and cried incessantly: 'I seek God! I seek God!'---As many of those who did not believe in God were standing around just then, he provoked much laughter. 'Has he got lost?' asked one. 'Did he lose his way like a child?' asked another. 'Or is he hiding?' 'Is he afraid of us?' 'Has he gone on a voyage?' 'emigrated?'---Thus they yelled and laughed. The madman jumped into their midst and pierced them with his eyes. 'Whither is God?' he cried; 'I will tell you. We have killed him---you and I. All of us are his murderers. But how did we do this? How could we drink up the sea? Who gave us the sponge to wipe away the entire horizon? What were we doing when we unchained this earth from its sun? Whither is it moving now? Whither are we moving? Away from all suns? Are we not plunging continually? Backward, sideward, forward, in all directions? Is there still any up or down? Are we not straying, as through an infinite nothing? Do we not feel the breath of empty space? Has it not become colder? Is not night continually closing in on us? Do we not need to light lanterns in the morning? Do we hear nothing as yet of the noise of the gravediggers who are burying God? Do we smell nothing as yet of the divine decomposition? Gods, too, decompose. God is dead. God remains dead. And we have killed him.
How shall we comfort ourselves, the murderers of all murderers?' - The Madman, Friedrich Nietzsche