Here is a thought experiment to test our attitudes to this view. Most thoughtful people are extremely concerned about climate change. Some stop eating meat, or flying abroad on vacation, in order to reduce their carbon footprint. But the people who will be most severely harmed by climate change have not yet been conceived. If there were to be no future generations, there would be much less for us to feel to guilty about.
So why don’t we make ourselves the last generation on earth? If we would all agree to have ourselves sterilized then no sacrifices would be required — we could party our way into extinction!
Of course, it would be impossible to get agreement on universal sterilization, but just imagine that we could. Then is there anything wrong with this scenario? Even if we take a less pessimistic view of human existence than Benatar, we could still defend it, because it makes us better off — for one thing, we can get rid of all that guilt about what we are doing to future generations — and it doesn’t make anyone worse off, because there won’t be anyone else to be worse off.
Is a world with people in it better than one without? Put aside what we do to other species — that’s a different issue. Let’s assume that the choice is between a world like ours and one with no sentient beings in it at all. And assume, too — here we have to get fictitious, as philosophers often do — that if we choose to bring about the world with no sentient beings at all, everyone will agree to do that. No one’s rights will be violated — at least, not the rights of any existing people. Can non-existent people have a right to come into existence?
I do think it would be wrong to choose the non-sentient universe. In my judgment, for most people, life is worth living.