Secular arguments for equal and exclusively human worth generally tend to follow one of two strategies. One, which has recently gained renewed attention because of a novel argument by S. Matthew Liao, aims to directly ground worth in an intrinsic property that all humans have in common, whereas the other concedes that there is no morally relevant intrinsic difference between all humans and all other animals, and instead appeals to the membership of all humans in a special kind. In this (...) article, I argue that both strategies necessitate drawing a line that is both arbitrary and implausibly opens a moral gulf between individuals whose difference from one another in terms of empirical reality is entirely unremarkable, providing reasons to reject them that go beyond the standard objections in the literature. I conclude that, if all humans are to be included in the community of equals, we must lay to rest the idea that we can do so without also including a wide range of non-human animals. (shrink)

This article identifies empirical, conceptual and normative avenues to advance the speciesism debate. First, I highlight the application of Evolutionary Debunking Arguments (EDAs) as one such avenue: especially where (anti-)speciesist positions heavily rely on appeals to moral intuition, and EDAs have potential to move the debate forward. Second, an avenue for conceptual progress is the delineation of speciesism from other views in its vicinity, specifically from the view that biological differences between species are sometimes morally relevant (‘species-relativism’). Third, if we (...) adopt Singer’s definition of speciesism, then a limitation of the current debate is that it is not obvious whether the core ethical principle that underlies anti-speciesist positions—the Principle of Equal Consideration of Interests—is widely applicable. Arguably, the interests of animals are often too dissimilar to establish what equal consideration amounts to. I underscore the need for integrating philosophical and empirical research, to come to terms with the extent to which the interests of members of different species are alike, and with the question of whether any dissimilarities might be morally relevant. (shrink)

The substance view is an account of personhood that regards all human beings as possessing instrinsic value and moral status equivalent to that of an adult human being. Consequently, substance view proponents typically regard abortion as impermissible in most circumstances. The substance view, however, has difficulty accounting for certain intuitions regarding the badness of death for embryos and fetuses, and the wrongness of killing them. Jeff McMahan’s time-relative interest account is designed to cater for such intuitions, and so I present (...) a proposal for strengthening the substance view by incorporating McMahan’s account – the Dual-Aspect Account of the morality of killing. I show that it resolves some important issues for the substance view while preserving its central premise of moral equality for all human beings. I then compare the Dual-Aspect Account with McMahan’s Two-Tiered Account of the morality of killing, which he derives from his time-relative interest account. (shrink)

There are few moral convictions that enjoy the same intuitive plausibility and level of acceptance both within and across nations, cultures, and traditions as the conviction that, normally, it is morally wrong to kill people. Attempts to provide a philosophical explanation of why that is so broadly fall into three groups: Consequentialists argue that killing is morally wrong, when it is wrong, because of the harm it inflicts on society in general, or the victim in particular, whereas personhood and human (...) dignity accounts see the wrongness of killing people in its typically involving a failure to show due respect for the victim and his or her intrinsic moral worth. I argue that none of these attempts to explain the wrongness of killing is successful. Consequentialism generates too many moral reasons to kill, cannot account for deeply felt and widely shared intuitions about the comparative wrongness of killing, and gives the wrong kind of explanation of the wrongness of killing. Personhood and human dignity accounts each draw a line that is arbitrary and entirely unremarkable in terms of empirical reality, and hence ill-suited to carry the moral weight of the difference in moral status between the individuals below and above it. Paying close attention to the different ways in which existing accounts fail to convince, I identify a number of conditions that any plausible account of the wrongness of killing must meet. I then go on to propose an account that does. I suggest that the reason that typically makes killing normal human adults wrong equally applies to atypical human beings and a wide range of non-human animals, and hence challenge the idea that killing a non-human animal is normally easier to justify than killing a human being. This idea has persisted in Western philosophy from Aristotle to the present, and even progressive moral thinkers and animal advocates such as Peter Singer and Tom Regan are committed to it. I conclude by discussing some important practical implications of my account. (shrink)

This article presents an argument for veganism, using a formal-axiomatic approach: a list of twenty axioms are explicitly stated. These axioms are all necessary conditions to derive the conclusion that veganism is a moral duty. The presented argument is a minimalist or core argument for veganism, because it is as parsimonious as possible, using the weakest conditions, the narrowest definitions, the most reliable empirical facts and the minimal assumptions necessary to reach the conclusion. If someone does not accept the conclusion, (...) logical consistency requires that s/he should be able to point at axiom on which s/he disagrees. The argument exposes hidden assumptions and provides a framework for an overview of the philosophical literature on animal rights and vegetarianism / veganism. (shrink)

Martha Nussbaum’s capabilities approach emphasizes species-specific abilities in grounding our treatment of animals. Though this emphasis provides many action-guiding benefits, it also generates a number of complications. The criticism registered here is that Nussbaum unjustifiably restricts what is allowed into our concept of species norms, the most notable restrictions being placed on latent abilities and those that arise as a result of human intervention. These restrictions run the risk of producing inaccurate or misleading recommendations that fail to correspond to the (...) true needs of animals. Here and throughout the essay the argument draws from the lives of captive apes, especially those with extensive experience with humans. A further criticism is that the normative guidance the capabilities approach does provide is merely at the level of heuristics. Preference testing, it is argued, also uses species norms profitably as a heuristic, but it does so within a much larger and fecund system of assessing an animal’s well-being. (shrink)

Just as one line appears to be longer than another in an optical illusion, we can have a spontaneous moral judgment that one individual is more important than another. Sometimes such judgments can lead to moral illusions like speciesism and other kinds of discrimination. Moral illusions are persistent spontaneous judgments that violate our deepest moral values and distract us away from a rational, authentic ethic. They generate pseudo-ethics, similar to pseudoscience. The antidote against moral illusions is the ethical principle to (...) avoid unwanted arbitrariness. Speciesism involves unwanted arbitrariness, and psychological research as well as the problem of wild animal suffering demonstrate that moral illusions such as speciesism can be very persistent. (shrink)

In his article ‘In Defense of Eating Meat’, Timothy Hsiao argued that sentience is not sufficient for moral status, that the pain experienced by an animal is bad but not morally bad, that the nutritional interests of humans trump the interests of animals and that eating meat is permissible. In this article I explore the strengths and weaknesses of Hsiao’s argument, clarify some issues and argue that eating meat is likely in conflict with some of our strongest moral intuitions.

I argue that Alasdair MacIntyre has important resources to provide in the debate over the moral status of severely disabled people. In contrast, Gregory Poore suggests that MacIntyre’s virtue theory cannot account for our responsibilities to severely disabled people. Given that MacIntyre bases his theory around community membership, this charge is made especially severe in the case of severely disabled strangers. I present an interpretation of MacIntyre that accounts for responsibilities to severely disabled strangers. I then argue that Poore is (...) wrong to conclude that MacIntyre does not include severely disabled people in communities. (shrink)

Metaphilosophy, Volume 53, Issue 1, Page 25-37, January 2022.

In the debate on the basis of moral equality, one conclusion achieves near consensus: that we must reject all accounts that ground equality in the possession of some psychological capacity (Psychological Capacity Accounts). This widely held view crystallises around three objections. The first is the Arbitrariness Objection, which holds that the threshold at which the possession of the relevant capacities places an individual within the required range is arbitrary. The second is the Variations Objection, which holds that there is rational (...) pressure to acknowledge that variations in psychological capacities between individuals are morally relevant. The third is the No Rational Agency Objection, according to which Psychological Capacity Accounts have unpalatable implications for our treatment of humans who do not possess the relevant capacities. We develop a Psychological Capacity Account based on the capacity for a conception of the good and offer a novel defence of the account against these objections. (shrink)