Haven't had one of these for awhile. This thread is for questions or comments that you've felt silly about not knowing/understanding. Let's try to exchange info that seems obvious, knowing that due to the illusion of transparency it really isn't so obvious!
(To the extent that I'm negative utilitarian, I'm a hedonistic negative utilitarian, so I can't speak for the preference NUs, but...)
Note that every utilitarian system breaks once you introduce even the possibility of infinities. E.g. a hedonistic total utilitarian will similarly run into the problem that, if you assume that a child has the potential to live for an infinite amount of time, then the child can be expected to experience both an infinite amount of pleasure and an infinite amount of suffering. Infinity minus infinity is undefined, so hedonistic total utilitarianism would be incapable of assigning a value to the act of having a child. Now saving lives is in this sense equivalent to having a child, so the value every action that has even a remote chance of saving someone's life becomes undefined as well...
A bounded utility function does help matters, but then everything depends on how exactly it's bounded, and why one has chosen those particular parameters.
I take it you mean to say that they don't spend all of their waking hours convincing other people not to have children, since it doesn't take that much effort to avoid having children yourself. One possible answer is that loudly advocating "you shouldn't have children, it's literally infinitely bad" is a horrible PR strategy that will just get your movement discredited, and e.g. talking about NU in the abstract and letting people piece the full implications themselves may be more effective.
Also, are they all transhumanists? For the typical person (or possibly even typical philosopher), infinite lifespans being a plausible possibility might not even occur as something that needs to be taken into account.
Does any utilitarian system have a good answer to questions like these? If you ask a total utilitarian something like "how much morning rush-hour frustration would you be willing to inflict to people in order to prevent an hour of intense torture, and how exactly did you go about calculating the answer to that question", you're probably not going to get a very satisfying answer, either.
Yes, and that is my precise point. Even if we assume a bounded utility function for human preferences, I think it's reasonable assume that it's a pretty huge function. Which means that antinatalism/negative preference utilitarianism would be willing to inflict massive suffering on existing people to prevent the birth of one person who would have a better life than anyone on Earth has ever had up to t... (read more)