In the last decade, the study of moral heuristics has gained in importance. I argue that we can consider speciesism as a moral heuristic: an intuitive rule of thumb that substitutes a target attribute (that is difficult to detect, e.g. “having rationality”) for a heuristic attribute (that is easier to detect, e.g. “looking like a human being”). This speciesism heuristic misfires when applied to some atypical humans such as the mentally disabled, giving them rights although they lack rationality. But I (...) argue that it is not necessarily irrational or inconsistent to hold on to this heuristic rule, because we have to take time and knowledge constraints, uncertainty aversion and emotional costs into account. However, this “heuristic defense” of speciesism uses a target attribute (rationality) that has implications of disrespect towards some atypical humans. Therefore, based on notions of impartiality and compassion, I argue for a morally better target attribute: sentience (“having a sense of well-being”). “Being a vertebrate” is suitable as a corresponding heuristic attribute because it is easy to detect and has a strong correlation with the target attribute of sentience. (shrink)

Rationality (or something similar) is usually given as the relevant difference between all humans and animals; the reason humans do but animals do not deserve moral consideration. But according to the Argument from Marginal Cases not all humans are rational, yet if such (marginal) humans are morally considerable despite lacking rationality it would be arbitrary to deny animals with similar capacities a similar level of moral consideration. The slippery slope objection has it that although marginal humans are not strictly speaking (...) morally considerable, we should give them moral consideration because if we do not we will slide down a slippery slope where we end up by not giving normal humans due consideration. I argue that this objection fails to show that marginal humans have the kind of direct moral status proponents of the slippery slope argument have in mind. (shrink)

I characterize the main approaches to the moral consideration of children developed in the light of the argument from 'marginal' cases, and develop a more adequate strategy that provides guidance about the moral responsibilities adults have towards children. The first approach discounts the significance of children's potential and makes obligations to all children indirect, dependent upon interests others may have in children being treated well. The next approaches agree that the potential of children is morally considerable, but disagree as to (...) whether and why children with intellectual disabilities are morally considerable. These approaches explore the moral significance of intellectual capacities, species membership, the capacity for welfare, and the interests of others. I argue that relationships characterized by reciprocity of care are morally valuable, that both the potential to be in such relationships and the actuality of being in them are morally valuable, and that many children with significant intellectual disabilities have this potential. (shrink)

In this paper I will examine two responses to the argument from marginal cases; the argument from kinds and the similarity argument. I will argue that these arguments are insufficient to show that all humans have moral status but no animals do. This does not prove that animals have moral status but it does shift the burden of proof onto those who want to maintain that all humans are morally considerable, but no animals are.

It is commonly thought that neo-Hobbesian contractarianism cannot yield direct moral standing for marginal humans and animals. However, it has been argued that marginal humans and animals can have a form of direct moral standing under neo-Hobbesian contractarianism: secondary moral standing. I will argue that, even if such standing is direct, this account is unsatisfactory because it is counterintuitive and fragile.

In this paper I will argue that Regan’s subjects-of-a-life account is epistemically irresponsible. Firstly, in making so many epistemic claims. Secondly in making the claims themselves.

Many social practices treat citizens with cognitive disabilities differently from their nondisabled peers. Does John Rawls's theory of justice imply that we have different duties of justice to citizens whenever they are labeled with cognitive disabilities? Some theorists have claimed that the needs of the cognitively disabled do not raise issues of justice for Rawls. I claim that it is premature to reject Rawlsian contractualism. Rawlsians should regard all citizens as moral persons provided they have the potential for developing the (...) two moral powers. I claim that every citizen requires specific Enabling Conditions to develop and exercise the two moral powers. Structuring basic social institutions to deny some citizens the Enabling Conditions is unjust because it blocks their developmental pathways toward becoming fully cooperating members of society. Hence, we have a duty of justice to provide citizens labeled with cognitive disabilities with the Enabling Conditions they require until they become fully cooperating members of society. (shrink)

Carl Cohen's arguments against animal rights are shown to be unsound. His strategy entails that animals have rights, that humans do not, the negations of those conclusions, and other false and inconsistent implications. His main premise seems to imply that one can fail all tests and assignments in a class and yet easily pass if one's peers are passing and that one can become a convicted criminal merely by setting foot in a prison. However, since his moral principles imply that (...) nearly all exploitive uses of animals are wrong anyway, foes of animal rights are advised to seek philosophical consolations elsewhere. I note that some other philosopher's arguments are subject to similar objections. (shrink)

The fact that humans have a special relationship to each other insofar as they belong in the same species is often taken to be a morally relevant difference between humans and other animals, one which justifies a greater moral status for all humans, regardless of their individual capacities. I give some reasons why this kind of relationship is not an appropriate ground for differential treatment of humans and nonhumans. I then argue that even if relationships do matter morally species membership (...) cannot justify a difference in moral status. This has important implications because it removes one barrier to giving animals greater moral status. (shrink)