Argument maps represent some arguments more effectively than others. The goal of this article is to account for that variability, so that those who wish to use argument maps can do so with more foresight. I begin by identifying four properties of argument maps that make them useful tools for evaluating arguments. Then, I discuss four types of argument that are difficult to map well: reductio ad absurdum arguments, charges of equivocation, logical analogies, and mathematical arguments. The difficulties presented by (...) these four types appear unrelated to one another, but I show that, in each case, the difficulty can be traced back to the use of metalinguistic reasoning. The need to represent a transition between object language and metalanguage can undermine one or more of the benefits that argument map representation would otherwise confer. (shrink)

This paper examines the issue of abortion from a Kantian perspective. More specifically, it focuses on Kant’s Formula of Humanity of the Categorical Imperative and the prohibition against treating humanity merely as a means. It has been argued by feminists that forcing a woman to continue a pregnancy against her will is treating her as a mere means for sustaining the fetus, a mere “fetal incubator”. Accordingly, feminists believe, this constitutes an assault on her humanity, the capacity for rationally setting (...) and pursuing her own ends. On the other hand, the woman who aborts her fetus can be seen as treating a being which has the potential for humanity merely as a means for her own ends. The Kantian discussion of abortion gives rise to a number of important questions: Does respecting the pregnant woman’s humanity, and hence enabling her to have an abortion if she chooses that way, go against appropriately respecting the fetus? What does it really mean to respect a fetus’ potential for humanity? Attempting to answer these questions helps us to see the Kantian prohibition against treating humanity merely as a means from a different, less familiar perspective, and puts out some new challenges to Kant’s theory. At the same time, it gives us new and useful insights on the much-discussed issue of the fetus’ status in the abortion debate. (shrink)

The formula of universal law (FUL) is a natural starting point for philosophers interested in a Kantian perspective on the morality of abortion. I argue, however, that FUL does not yield much in the way of promising or substantive conclusions regarding the morality of abortion. I first reveal how two philosophers' (Hare's and Gensler's) attempts to use Kantian considerations of universality and prescriptivity fail to provide analyses of abortion that are either compelling or true to Kant=s understanding of FUL. I (...) then turn to some recent interpretations of Kant=s FUL contradiction in conception (CC) and contradiction in will (CW) tests. I argue that none of the interpretations of the CC testBincluding the practical interpretation favored by KorsgaardBdoes much to reveal moral problems with maxims of abortion. The CW test (as developed by Herman) is more helpful. Nevertheless, I argue that neither by considering abortion maxims as a subset of maxims of convenience killing, nor by considering such maxims as maxims of refusing to aid, can the CW test generate a general prohibition of abortion. At best, the CW test illuminates the abortion issue because by forcing us to think about how killing a fetus differs from killing other human beings, what attitudes we may reasonably have toward a fetus, and whether Kant's moral theory must be amended to do justice to the problem of abortion. But to pursue these questions, we must look beyond FUL; Kant’s formula of humanity and doctrine of virtue may well have more to offer. (shrink)

This paper discusses the method when an argument is refuted by a parallel argument since the flaw of the parallel argument is clearly displayed. The method is explicated, examined and compared with two other general methods.