A comprehensive study of the ethics of killing in cases in which the metaphysical or moral status of the individual killed is uncertain or controversial. Among those beings whose status is questionable or marginal in this way are human embryos and fetuses, newborn infants, animals, anencephalic infants, human beings with severe congenital and cognitive impairments, and human beings who have become severely demented or irreversibly comatose. In an effort to understand the moral status of these beings, this book develops and (...) defends distinctive accounts of the nature of personal identity, the evaluation of death, and the wrongness of killing. The central metaphysical claim of the book is that we are neither nonmaterial souls nor human organisms but are instead embodied minds. In ethical theory, one of the central claims is that the morality of killing is not unitary; rather, the principles that determine the morality of killing in marginal cases are different from those that govern the killing of persons who are self‐conscious and rational. Another important theme is that killing in marginal cases should be evaluated in terms of the impact it would have on the victim at the time rather than on the value of the victim's life as a whole. What primarily matters is how killing would affect that which would be rational for the victim to care about at the time of death. By appealing to various foundational claims about identity, death, and the morality of killing, this book yields novel conclusions about such issues as abortion, prenatal injury, infanticide, the killing of animals, the significance of brain death, the termination of life support in cases of persistent vegetative state, the use of anencephalic infants as sources of organs for transplantation, euthanasia, assisted suicide, and advance directives in cases of dementia. In particular, the book defends the moral permissibility of abortion, infanticide, and euthanasia in certain cases and argues that brain death is not the appropriate criterion of death either for a person or a human organism. (shrink)

Most people are skeptical of the claim that the expectation that a person would have a life that would be well worth living provides a reason to cause that person to exist. In this essay I argue that to cause such a person to exist would be to confer a benefit of a noncomparative kind and that there is a moral reason to bestow benefits of this kind. But this conclusion raises many problems, among which is that it must be (...) determined how the benefits conferred on people by causing them to exist weigh against comparable benefits conferred on existing people. In particular, might the reason to cause people to exist ever outweigh the reason to save the lives of existing people? (shrink)

The morality of embryonic stem cell research depends on the moral status of human embryos. I defend the interest view against some of Don Marquis's objections, and show that on his own Valuable Futures account, ESCR is morally permissible.

Embryonic stem cell research is morally and politically controversial because the process of deriving the embryonic stem cells kills embryos. If embryos are, as some would claim, human beings like you and me, then ES cell research is clearly impermissible. If, on the other hand, the blastocysts from which embryonic stem cells are derived are not yet human beings, but rather microscopic balls of undifferentiated cells, as others maintain, then ES cell research is probably morally permissible. Whether the research can (...) be justified depends on such issues as its cost, chance of success, and numbers likely to benefit. But this is an issue for any research project, not just ES cell research. What makes the debate over ES cell research controversial is that it, like the debate over abortion, raises “questions that politicians cannot settle: when does human life begin, and what is the moral status of the human embryo?” This paper looks at several theories of moral status and their implications for embryo research. (shrink)