A central question in contemporary ethics and political philosophy concerns which entities have moral status. In this article, I provide a detailed analysis of the view that moral status comes in degrees. I argue that degrees of moral status can be specified along two dimensions: (i) the weight of the reason to protect an entity’s morally significant rights and interests; and/or (ii) the rights and interests that are considered morally significant. And I explore some of the complexities that arise when (...) we link degrees of moral status to the weight of reasons to protect bundles and/or the content and size of these bundles, in particular regarding the attribution of moral status to nonparadigmatic entities (e.g. people with severe cognitive disabilities, children, embryos and foetuses, robots, non-human animals, ecosystems, and rivers). (shrink)

Why should we become posthuman? There is only one morally compelling answer to this question: because posthumanity will be a more beneficial state, better than present humanity. This is the Posthuman Beneficence Argument, the centerpiece of the liberal transhumanist defense of “directed evolution.” In this article, I examine PBA and find it deficient on a number of lethal counts. My argument focuses on the writings of transhumanist philosopher Nick Bostrom, who has developed the most articulate defense of PBA and disclosed (...) its metaethical framework. I begin by locating PBA in the context of wider transhumanist claims for the desirability of posthumanity. I identify two crucial components: a model of deliberative rationality, requiring reasons to endorse claims; and the reasons themselves. I examine these two conditions, in turn, specifying the claims that they ask us to accept. Following Bostrom, I argue that there is a need for a foundationalist approach that assures us of some universality in the process of valuation. This is required to appropriately ground the moral continuity and appeal to universality that PBA demands. I examine the reasons why this approach ultimately fails, leaving posthumanity as an unintelligible concept with no moral force. I conclude by identifying a more mature approach to the debate on human enhancement, one that forfeits the grandiose but baseless claims too often found in transhumanist defenses of directed evolution. In short, posthumanity may be a good science fiction trope, but it has no normative force in the moral philosophy of human enhancement. (shrink)

:Many critics of bioenhancement go to considerable lengths to establish the existence of reasons against pursuing bioenhancements but do little to establish the absence of reasons in favor. This suggests that they accept what Allen Buchanan has called the conclusive reasons view. According to this view, our reasons against bioenhancement are obviously decisive, so there is no need to balance them against countervailing reasons. Buchanan criticizes the CRV by showing that the reasons most commonly adduced against bioenhancement are not decisive, (...) or, at least, not obviously so.In this article, I suggest that both Buchanan and the authors to whom he is responding underestimate the strength of the case for the CRV. There are, I argue, harm-based reasons against bioenhancement that provide stronger support to the CRV than the reasons that have most often been adduced by critics of enhancement. However, I then argue that even these harm-based reasons are not obviously decisive. Thus, I ultimately agree with Buchanan about the falsity of the CRV, though I disagree with him about the reasons for its falsity. (shrink)

Several authors have speculated that (1) the pharmaceutical, genetic or other technological enhancement of human mental capacities could result in the creation of beings with greater moral status than persons, and (2) the creation of such beings would harm ordinary, unenhanced humans, perhaps by reducing their immunity to permissible harm. These claims have been taken to ground moral objections to the unrestrained pursuit of human enhancement. In recent work, Allen Buchanan responds to these objections by questioning both (1) and (2). (...) I argue that Buchanan’s response fails. However, I then outline an alternative response. This response starts from the thought that, though moral status-increasing human enhancements might render ordinary, unenhanced humans less immune to permissible harm, they need not worsen the overall distribution of this immunity across beings. In the course of the argument I explore the relation between mental capacity and moral status and between moral status and immunity to permissible harm. (shrink)

This chapter reviews recent philosophical and neuroethical literature on the morality of moral neuroenhancements. It first briefly outlines the main moral arguments that have been made concerning moral status neuroenhancements. These are neurointerventions that would augment the moral status of human persons. It then surveys recent debate regarding moral desirability neuroenhancements: neurointerventions that augment that the moral desirability of human character traits, motives or conduct. This debate has contested, among other claims (i) Ingmar Persson and Julian Savulescu’s contention that there (...) is a moral imperative to pursue the development of moral desirability neuroenhancements, (ii) Thomas Douglas’ claim that voluntarily undergoing moral desirability neuroenhancements would often be morally permissible, and (iii) David DeGrazia’s claim that moral desirability neuroenhancements would often be morally desirable. The chapter discusses a number of concerns that have been raised regarding moral desirability neuroenhancements, including concerns that they would restrict freedom, would produce only a superficial kind of moral improvement, would rely on technologies that are liable to be misused, and would frequently misfire, resulting in moral deterioration rather than moral improvement. (shrink)

Despite the prominence of thresholds and limits in theories of distributive justice, there is no general account of their role within such theories. This has allowed an ongoing lack of clarity and misunderstanding around threshold views in distributive justice. In this thesis, I develop an account of the conceptual structure of such views. Such an account helps understand and characterize threshold views, can subsume what may seem to be different debates about such views under one conceptual header, and can be (...) used to further examine and develop patterns of justice that draw on thresholds. In light of this account, I propose a novel characterization of sufficientarianism which sheds new light on the distinctiveness of sufficientarianism as a distributive principle and on the common objections to sufficientarianism. Moreover, I examine and defend limitarianism, which is the view that people should not have more than a certain amount of wealth. In particular, I argue in favour of limitarianism as a midlevel principle for guiding institutional design and individual actions and, furthermore, as a specification of what a just allocation of wealth requires under epistemic constraints. (shrink)

Should we cognitively alter animals in ways that might change their moral status? There has been some discussion of this question. For example, Chan (2009) and Chan and Harris (2001) consider whether we should radically enhance the cognitive capacities of animals, while Thompson (2008) and Shriver (2009) argue that we should in fact substantially disenhance some animals to protect them from suffering. More controversially, some have countenanced radical and possibly moral status-altering transformations of human persons. ... One question relevant to (...) all of these discussions is whether it is good for a being to have moral status; whether a being’s moral status contributes to its wellbeing or (as I take to be equivalent) has prudential value for that being. (shrink)