Drawing Distinctions

Introducing or refining moral concepts is an important way of embellishing moral reason. Concepts that pick out distinctive moral issues more clearly are useful ways of furthering ethical debate. Concepts can be defined in a number of ways. In addition to introducing a new concept, arguments can be progressed by considering what must be the case about a concept that is in use in order for it to do the ethical work asked of it. This kind of strategy is what I call drawing ‘transcendental’ distinctions. This chapter describes how distinctions are drawn within slippery-slope arguments, how new concepts can be introduced for a specific moral purpose, and how existing concepts can be refined and theorized. Slippery-slope arguments are quite common in bioethics and, as I will show, can be difficult to sustain and are vulnerable to some common objections.