People often criticise me of thinking of potential people as Steven Landsburg describes without necessarily endorsing:
…like prisoners being held in a sort of limbo, unable to break through into the world of the living. If they have rights, then surely we are required to help some of them escape.
Such people seem to believe this position is required for considering creating good lives an activity with positive value. It is not required, and I don’t think of potential people like that. My position is closer to this:
Benefit and harm are comparative notions. If something benefits you, it makes your life better than it would have been, and if something harms you it makes your life worse than it would have been. To determine whether some event benefits or harms you, we have to compare the goodness of your life as it is, given the event, with the goodness it would otherwise have had. The comparison is between your whole life as it is and your whole life as it would have been. We do not have to make the comparison time by time, comparing each particular time in one life with the same time in the other life.
That is John Broome explaining why death harms people even if they hold that all benefit and harm consists of pleasure and pain, which are things that can’t happen when you are dead. The same goes for potential people.
Yes, you can’t do much to a person who doesn’t exist. They don’t somehow suffer imaginary pains. If someone doesn’t exist in any possible worlds I agree they can’t be helped or harmed at all. What makes it possible to affect a potential person is that there are some worlds where they do exist. It is in the comparison between these worlds and the ones where they don’t exist where I say there is a benefit to them in having one over the other. The benefit of existing consists of the usual things that we hold to benefit a person when they exist; bananas, status, silly conversations, etc. The cost of not existing relative to existing consists of failing to have those benefits, which only exist in the world where the person exists. The cost does not consist of anything that happens in the world where the person doesn’t exist. They don’t have any hypothetical sorrow, boredom or emptiness at missing out. If they did have such things and they mattered somehow, that would be another entirely separate cost.
Often it sounds crazy that a non-existent person could ‘suffer’ a cost because you are thinking of pleasures and pains (or whatever you take to be good or bad) themselves, not of a comparison between these things in different worlds. Non-existent people seem quite capable of not having pleasures or pains, not having fulfilled preferences, not having worthwhile lives, of not having anything at all, of not even having a capacity to have. Existent people are quite capable of having pleasures (and pains) and all that other stuff. If you compare the two of them, is it really so implausible that one has more pleasure than the other?
‘Potential people’ makes people think of non-existing people, but for potential people to matter morally, it’s crucial that they do exist in some worlds (in the future) and not in others. It may be better to think of them as semi-existing people.
I take it that the next counterargument is something like ‘you can’t compare two quantities when one of them is not zero, but just isn’t there. What’s bigger, 3 or … ?’ But you decide what quantities you are comparing. You can choose a quantity that doesn’t have a value in one world if you want. Similarly I could claim all the situations you are happy to compare are not comparable. Getting one hundred dollars would not benefit you, because ‘you without a hundred dollars’ just won’t be around in the world where you get paid. On the other hand if you wanted to compare benefits to Amanda across worlds where she may or may not exist, you could compare ‘how much pleasure is had by Amanda’, and the answer would be zero in worlds where she doesn’t exist. Something makes you prefer an algorithm like ‘find Amanda and see how much pleasure she has got’, where you can just fail at the finding Amanda bit and get confused. The real question is why you would want this latter comparison. I can see why you might be agnostic, waiting for more evidence of which is the true comparison of importance or something, but I don’t recall hearing any argument for leaping to the non-comparable comparison.
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In other cases it is intuitive to compare quantities that have values, even when relevant entities differ between worlds. Would you say I have no more orange juice in my cup if I have a cup full of orange juice than if I don’t have a cup or orange juice? I won’t, because I really just wanted the orange juice. And if you do, I won’t come around to have orange juice with you.
I have talked about this a bit before, but not explained in much detail. I’ll try again if someone tells me why they actually believe the comparison between a good life and not existing should come out neutral or with some non-answer such as ‘undefined’. Or at least points me to where whichever philosophers have best explained this.