To bring into existence someone who will suffer is, Benatar argues, to harm that person, but to bring into existence someone who will have a good life is not to benefit him or her. Few of us would think it right to inflict severe suffering on an innocent child, even if that were the only way in which we could bring many other children into the world. Yet everyone will suffer to some extent, and if our species continues to reproduce, we can be sure that some future children will suffer severely. Hence continued reproduction will harm some children severely, and benefit none.
Benatar also argues that human lives are, in general, much less good than we think they are. We spend most of our lives with unfulfilled desires, and the occasional satisfactions that are all most of us can achieve are insufficient to outweigh these prolonged negative states.
Even though Singer ends up arguing against the pessimistic view, it’s clear that he thinks this is the central concern for modern man.
I do think it would be wrong to choose the non-sentient universe. In my judgment, for most people, life is worth living. Even if that is not yet the case, I am enough of an optimist to believe that, should humans survive for another century or two, we will learn from our past mistakes and bring about a world in which there is far less suffering than there is now. But justifying that choice forces us to reconsider the deep issues with which I began. Is life worth living? Are the interests of a future child a reason for bringing that child into existence? And is the continuance of our species justifiable in the face of our knowledge that it will certainly bring suffering to innocent future human beings?
I find the whole line of questioning to be absurd. It’s a kind of anti-existentialism, in which we are asked to take responsibility for determining the emotional state of people in the future. Yet, just as we were born into circumstances outside of our control, so will they be. Singer’s infantile obsessions with determinism and controlling happiness indicate deep pathological problems that are rooted in Enlightenment rationalism and scientific positivism.