This paper is a critical examination of the so-called slippery slope argument for the conservative position on abortion. The argument was discussed in the philosophic literature some time back, but has since fallen into disfavor. The argument is first exposed and a general objection to it is advanced, then rebutted. Rosalind Hursthouse's more detailed and stronger objection is next aired, but also found less than convincing. In the course of discussing her objection, the correct form of the argument is identified, (...) and it's noted that rejection of the argument requires finding fault with its inductive premise. That, in turn, requires either (a) identifying and defending a cutoff point other than conception, or (b) not identifying a cutoff point but directly attacking the argument's conclusion. As far as (a) is concerned, all except one alternative cutoff point have severe problems that have been well discussed in the literature. The one that doesn't, the appearance of the ‘primitive streak’, is examined in detailed, but ultimately rejected. As for (b), five different grounds for rejecting the conclusion are identified and discussed, but none is found plausible. Variations on the slippery slope argument, concerning different conclusions that it may have, are then distinguished, related to each other, and critically discussed, and the paper ends with some cautionary remarks about the defense of the argument tendered. (shrink)

When does a human being begin to exist? We argue that it is possible, through a combination of biological fact and philosophical analysis, to provide a definitive answer to this question. We lay down a set of conditions for being a human being, and we determine when, in the course of normal fetal development, these conditions are first satisfied. Issues dealt with along the way include: modes of substance-formation, twinning, the nature of the intra-uterine environment, and the nature of the (...) relation between fetus and mother (connection, parthood, dependence). (shrink)

Slippery slope arguments are frequently dismissed as fallacious or weak arguments but are nevertheless commonly used in political and bioethical debates. This paper gives an overview of different variants of the argument commonly found in the literature and addresses their argumentative strength and the interrelations between them. The most common variant, the empirical slippery slope argument, predicts that if we do A, at some point the highly undesirable B will follow. I discuss both the question which factors affect likelihood of (...) slippage and the relation between the strength of the prediction and the justificatory power of the argument. (shrink)

Slippery slope arguments (SSAs) are, so I argue, arguments from consequences which have the following peculiar characteristic: They take advantage of our being less than perfect in making—and acting according to—distinctions. But then, once SSAs are seen for what they are, they can be turned against themselves. Being less than perfect at making the second‐order distinction between distinctions we're good at abiding by and those we're bad at abiding by, we're bound to fail to make the distinction between good and (...) bad SSAs. One can therefore construct an SSA, the conclusion of which is, that we ought not to use SSAs. After characterizing SSAs and constructing the SSA against the use of SSAs, I then explore its implications. (shrink)

The abortion debate rages on. Yet the two most popular positions seem to be clearly mistaken. Conservatives maintain that a human life begins at conception and that therefore abortion must be wrong because it is murder. But not all killings of humans are murders. Most notably, self defense may justify even the killing of an innocent person.Liberals, on the other hand, are just as mistaken in their argument that since a fetus does not become a person until birth, a woman (...) may do whatever she pleases in and to her own body. First, you cannot do as you please with your own body if it affects other people adversely. Second, if a fetus is not a person, that does not imply that you can do to it anything you wish. Animals, for example, are not persons, yet to kill or torture them for no reason at all is wrong. (shrink)