Because I like it. It doesn’t matter to the rocks and stars and planets and universe if human beings have decent lives, or spend their miserable lives in agonizing pain. But it matters to me, because I am a human being. I don’t want to live my short miserable life in agony, I want to enjoy my life, see my kids grow up, love my family, and avoid as much pain as I reasonably can.
If tomorrow a terrorist shoots me in the face and I die in agony, well, that’s what will happen, and how I feel about it won’t change the fact that it will happen. And then I’ll be dead, and eventually everyone who knew me will be dead, and I’ll be forgotten just like all the other billions of dead and forgotten people in the world. And eventually the sun will either burn out or swell up and the Earth will either burn or freeze and all life will come to an end. And the galaxy will continue wheeling indifferently.
Just because I will eventually die and be forgotten doesn’t mean I want to die today, or tomorrow, or any time soon. And just because I don’t want to die doesn’t mean I put infinite value on my own life. I’d give my life to save my children. I’d rather be dead than be alive with the knowledge that I let my children die to save my miserable skin.
And what’s the point of all of it? Why do I want to live and not die, why do I want to love my children and wife, why do I want to eat tasty food, wear loose shoes and have a warm place to shit? Because I am an animal that evolved to like these things, my animal ancestors that didn’t care whether they lived or reproduced didn’t live and reproduce and so I am descended from a long line–billions of years old–of organisms that fought to live and reproduce, and so of course I want the same thing.
But that doesn’t mean I think it means something. If a terrorist shoots me the only bad thing that will happen is that I’ll be dead, and how you feel about that depends on whether you care if I live or die. If you don’t care, then it won’t matter, any more than it matters to me that some random guy in Nigeria got shot yesterday.
But since I like living, I prefer to live in a society where people don’t shoot each other. I mean, I suppose I might enjoy shooting people if only I gave it a chance, but I’d rather forgo that dubious pleasure in return for a law that forbids everyone from shooting anyone, except when we, like, really have to for some reason. And I like living in a society where not only I am not worried about being shot every day, but most people around me aren’t worried about being shot, because then then can get shit done rather than hiding inside their fortified hovels.
And this is all my personal preference, and since most people are like me, we enforce our personal preferences on everyone else, even people who like shooting other people. And God doesn’t care, because I don’t believe that an entity that deserves to be called “God” exists. But even if I did think that God existed, and that God had an opinion about who’s shooting and fucking who, how would that ground morality in an objective rather than subjective basis?
Who’s this God person, and why do his opinions matter? Oh, he created the Universe? Yes, and this is important why? He created the Universe such that murder and fucking your sister is objectively wrong? Well, that’s just God’s opinion about how the Universe should run, if he decided tomorrow that setting babies on fire and raping nuns was good, then that would magically turn good.
Or do God’s opinions not make good good and evil evil, but rather he’s telling us about good and evil and we should listen up because God is a smart guy? OK, then God doesn’t create good and evil, he just is trying to help us? Setting babies on fire is wrong, not because God says so, but because hurting babies is wrong whether God tells us to or not? OK, but then where does this “objective” morality come from then? If God created it then it’s like God deciding that from now on 2+2=5 and it becomes so? Or is it true that God can’t or won’t decide tomorrow that 2+2=5, or that 2+2=purple?
If God can’t change things then he’s just a schmuck like the rest of us, whether he created the world or human beings or not. Dr. Frankenstein created a creature, that doesn’t make Dr. Frankenstein the font of objective morality for his creation.
Of course I don’t believe in God, or Zeus, or whatever. But people who believe in Zeus are in the same boat I am, and so are people who believe in the God of Abraham and Moses, and so are the people who believe that God is the uncaused first cause that creates the field of being for our universe. We’re left adrift to try to organize our lives as we see fit and all that will happen is that we will succeed or fail. And just because we will be rewarded or punished for our actions in some stipulated after-world the rewards or punishments don’t make our actions right or wrong, just wise or unwise depending on whether we prefer rewards to punishments.