“It was all a cruel angel’s thesis from the start”: Folk intuitions about Zygote cases do not support the Zygote argument

Manipulation arguments that start from the intuition that manipulated agents are neither free nor morally responsible then conclude to that free will and moral responsibility are incompatible with determinism. The Zygote argument is a special case of Manipulation argument in which the manipulation intervenes at the very conception of the agent. In this paper, I argue that the Zygote argument fails because (i) very few people share the basic intuitions the argument rests on, and (ii) even those who share this intuition do so for reasons that are unrelated to determinism. Rather, I argue that intuitions about the Zygote argument (and Manipulation arguments in general) are driven by people's intuitions about the deep self, as shown by the fact that intuitions about manipulated agents depend on the moral value of the agent's behavior.

Physical Determinism, Zygote-Manipulation and Responsible Agency

Agents have no control over the formation of their own zygote. Others may do. According to a well-known argument, the so-called Zygote Argument for incompatibilism, these facts, together with a prima facie plausible further assumption, are sufficient to prove that human agents cannot be responsible for their actions if they live in a deterministic universe. This paper argues that the lack of agents’ control over the constitution of their own zygote can undermine their responsibility only in exceptional conditions and that the occurrence or non-occurrence of those conditions has nothing to do with the truth or falsity of determinism. What undermines agents’ responsibility in the situations described by the Zygote Argument is the occurrence of some specific initial conditions which may render the manipulation of agents’ behaviour possible, and not the truth of determinism.

The Zygote Argument Is Still Invalid: So What?

In “The Zygote Argument is Invalid: Now What?”, Kristin Mickelson argues that Alfred Mele’s original Zygote Argument is invalid: its two premises tell us merely that the truth of determinism is (perhaps spuriously) correlated with the absence of free human agents, but the argument nonetheless concludes with a specific explanation for that correlation, namely that deterministic laws (of the sort described by determinism) preclude—rule out, destroy, undermine, make impossible, rob us of—free will. In a recent essay, Gabriel De Marco grants that the original Zygote Argument is invalid for the reasons that Mickelson has identified, and claims that he has developed two new solutions to her invalidity objection. In this essay, I argue that both of his proposed solutions are nonstarters, the first fails as a “rescue” because it simply restates an extant solution in new jargon and the second fails because it consists in another invalid variant of the original Zygote Argument.

Bullet Biting and Beyond

Compatibilists who reject even the modest externalist theses defended thus far in this book seem to be stuck biting some extremely hard bullets. A question about bullet biting is this chapter’s focus. It is roughly this: When should compatibilists about moral responsibility bite the bullet in responding to stories used in arguments for incompatibilism about moral responsibility or in arguments for theses that typical compatibilists would reject? The question is clarified, and a partial answer is offered. Thought experiments discussed include radical reversal stories and original-design stories. John Fischer’s response to an argument based on an original-design story—the zygote argument—receives close critical attention.