If it were the case that the absence of pleasure is bad even if someone does not exist to experience its absence, then we would have a significant moral reason to create a child and to create as many children as possible. And if it were not the case that the absence of pain is good even if someone does not exist to experience this good, then we would not have a significant moral reason not to create a child. Someday we can regret for the sake of a person whose existence was conditional on our decision, that we created them – a person can be unhappy and the presence of their pain would be a bad thing.