Francois Tremblay, from the parent debate:
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It is widely agreed upon that we have a duty not to create harm (we have a duty not to kill, attack, rape, defraud other people), but it is also widely agreed upon that we do not have a duty to provide pleasure (for one thing, such a duty would conflict with the duty not to harm, since it may very well give pleasure to a lot of people to kill, attack, rape or defraud others, at least in certain situations). If we assume that these universal intuitions are correct, then clearly it is wrong to start new human lives, since we have a duty not to create the harm that will inevitably befall it, while we have no duty to create the pleasure that will also befall it.
By "duty," I mean a strong and far-reaching ethical obligation. If the term "duty" is found problematic, then I have no problem replacing it with such a definition or a similar definition.
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Since Francois is unsure if "duty" is an ok term, I'll add it as a defined term to make sure everyone agrees.
Ken, please respond to this point here, though you can feel free wait until the "duty" issue is resolved in case you have an issue with it.