I think this is actually a central question that is relatively unresolved among philosophers, but it is my impression that philosophers in general, and EAs in particular, lean in the "making happy people" direction. I think of there as being roughly three types of reason for this. One is that views of the "making people happy" variety basically always wind up facing structural weirdness when you formalize them. It was my impression until recently that all of these views imply intransitive preferences (i.e something like A>B>C>A), until I had a discussion with Michael St Jules in which he pointed out more recent work that instead denies the independence of irrelevant alternatives. This avoids some problems, but leaves you with something very structurally weird or even absurd to some. I think Larry Temkin has a good quote about it something like "I will have the chocolate ice-cream, unless you have vanilla, in which case I will have strawberry".
The second reason is the non-identity problem, formalized by Derek Parfit. Basically the issue this raises is that almost all of our decisions that impact the longer term future in some way also change who gets born, so a standard person affecting view seems to allow us to do almost anything to future generations. Use up all their resources, bury radioactive waste, you name it.
The third maybe connects more directly to why EAs in particular often reject these views. Most EAs subscribe to a sort of universalist, beneficent ethics, that seems to imply that if something is genuinely good for someone, then that something is good in a more impersonal sense that tugs on ethics for all. For those of us who live lives worth living, are glad we were born, and don't want to die, it seems clear that existence is good for us. If this is the case, it seems like this presents a reason for action to anyone who can impact it if we accept this sort of universal form of ethics. Therefore, it seems like we are left with three choices. We can say that our existence actually is good for us, and so it is also good for others to bring it about, we can say that it is not good for others to bring it about, and therefore it is not actually good for us after all, or we can deny that ethics has this omnibenevolent quality. To many EAs, the first choice is clearly best.
I think here is where a standard person-affecting view might counter that it cares about all reasons that actually exist, and if you aren't born, you don't actually exist, and so a universal ethics on this timeline cannot care about you either. The issue is that without some better narrowing, this argument seems to prove too much. All ethics is about choosing between possible worlds, so just saying that a good only exists in one possible world doesn't seem like it will help us in making decisions between these worlds. Arguably the most complete spelling out of a view like this looks sort of like "we should achieve a world in which no reasons for this world not to exist are present, and nothing beyond this equilibrium matters in the same way". I actually think some variation of this argument is sometimes used by negative utilitarians and people with similar views. A frustrated interest exists in the timeline it is frustrated in, and so any ethics needs to care about it. A positive interest (i.e. having something even better than an already good or neutral state) does not exist in a world in which it isn't brought about, so it doesn't provide reasons to that world in the same way. Equilabrium is already adequetely reached when no one is badly off.
This is coherent, but again it proves much more than most people want to about what ethics should actually look like, so going down that route seems to require some extra work.
I'm also in favour of making-people-happy over making-happy-people.
I said this below in a reply, but I just want to flag that: some people assume that if you're in the making-people-happy/person-affecting camp, you must not care about future people. This isn't true for me - I do care about future people and hope they have good lives. Because there almost-certainly will be people in the future, for me, improving the future counts as making-people-happy! But I'm indifferent about how many happy people there are.
Exactly. I'm actually a bit puzzled as to why this needs to be made explicit. When we say "indifferent about making happy people", it seems hard to interpret this as indifferent about whether future people will be happy or not. Or am I misreading something here?
It's possible you are. There are some strains of person-affecting view that are genuinely indifferent to future people, but most person-affecting theorists do accept that being in the future isn't what makes the difference. What I (and I think some others in this thread) are pointing to is that, even though in theory person-affecting views care about the welfare of future generations, in practice, without making some very difficult modifications to the way the theory thinks of identity that arguably no one has fully pulled off, it still implies near total indifference between impacts on the future.
The reason is basically that personal identity is very fragile. If you were conceived a moment earlier or later, it would have been with a different sperm. Even if it was the same sperm, what if it splits and you have an identical twin in one timeline, and it doesn't split in the other, which of you is made happier by benefits to this timeline where the zygote doesn't split? Given this, and the messy, ripple effects that basically all attempts to impact the future even a couple of generations out will have, you are choosing between two different sets of future people whenever you are choosing between policies that impact the future. That is, you are not making future people better off rather than worse off, you are choosing whether a happy group of people gets born, or a different, less happy group.
This sounds academic and easy to just escape from in same number of people cases, but the tricky thing about choosing between distributions of happy people rather than just making people happy is the future scenarios in which not only the identities, but also numbers of these people differ. If you try to construct a view which cares about whatever people exist being well-off, and is indifferent to both these identity considerations and numbers, the most obvious formalization of this is averagism for instance. Unforunately averagism conflicts pretty strongly with person-affecting views, including in ways people often find very absurd (which is why most people aren't averagists).
Consider for instance the "sadistic conclusion". If you have a group of very happy people, and you can choose to either bring into existence one person whose life isn't worth living, or many people whose lives are worth living, but much less happy than the existing people, than averagism can tell you to bring into existence the life not worth living. The basic problem is that, between two options, it can favor the world in which no one is better off and some are worse off, if this happens in such a way that the distribution of welfare is shifted to have more of the population in the best off group.
Averagism isn't person-affecting at all,though, since it can prioritize creation over existing people, all else equal, and even if it were the most obvious formulation, this doesn't seem very relevant, since we should consider the best formulations to steelman person-affecting views.
There are person-affecting views that handle different number and different identity cases, although I suppose they're mostly pretty recent (from the last ~10 years), e.g.:
I think the obvious formulation is relevant to the point I was trying to make, in particular, I was trying to get ahead of what I think is a pretty common first reaction to the non-identity problem. That it is an interesting point, but also clearly too technical and academic to really undermine the theory in practice, so whatever it says it cares about, we should just modify the theory so that it doesn't care about that. I think this is a natural first reaction, but also the non-identity problem raises genuine substantial issues that have stumped philosophers for decades, and just about any solution you come up with is going to have serious costs and/or revisions from a conventional person-affecting view, for instance if averagism is more superficially similar to person-affecting views (in terms of caring about quality of life rather than quantity), totalism is actually closer to person-affecting logic in practice (it is more intuitive that you in some sense can benefit someone by bringing them into a life worth living than that you benefit someone by making sure they aren't born into a life worth living but less so than average), but these are the things totalism and averagism respectively can tradeoff against the welfare of those two worlds have in common. It wouldn't surprise me if there was more promising work out there on this issue, you certainly seem better read on it than me, though it would surprise me if it really contradicted the point about serious costs and revisions I am trying to indicate.
I think the main costs for wide person-affecting views relative to narrow ones for someone who wanted to solve the nonidentity problem are in terms of justifiability (not seeming too ad hoc or arbitrary) and complexity in order to "match" merely possible people with different identities across possible worlds, as in the nondidentity problem. I think for someone set on solving both the nonidentity problem and holding person-affecting views, there will be views that will do intuitively better to them than the closest narrow person-affecting in basically all cases. What I'm imagining is that for most narrow views, there's a wide modification of the view based on identifying counterparts across worlds that would just match their intuitions about cases better in some cases and never worse. I'm of course not 100% certain, but I expect this to usually approximately be the case.
We need a different name for those people who will be, and potential future people. We can be concerned for the former and indifferent to the latter.
MacAskell has a Gedanken about imagining yourself as all the future people. He drifts from future people to potential future people. By conflating the two he attempts to fool us into concern for the latter . https://www.nytimes.com/2022/08/05/opinion/the-case-for-longtermism.html
Since these hypothetically large number of people are the product of this thought experiment, I like to call them Gedanken people, as distinguished from future people.