Unbelievable Errors defends an error theory about all normative judgements: not just moral judgements, but also judgements about reasons for action, judgements about reasons for belief, and instrumental normative judgements. This theory states that normative judgements are beliefs that ascribe normative properties, but that normative properties do not exist. It therefore entails that all normative judgements are false. -/- Bart Streumer also argues, however, that we cannot believe this error theory. This may seem to be a problem for the theory. (...) But he argues that it makes this error theory more likely to be true, since it undermines objections to the theory and it makes it harder to reject the arguments for the theory. -/- He then sketches how certain other philosophical theories can be defended in a similar way. He concludes that to make philosophical progress, we need to make a sharp distinction between a theory's truth and our ability to believe it. (shrink)

According to the error theory, normative judgements are beliefs that ascribe normative properties, even though such properties do not exist. In this paper, I argue that we cannot believe the error theory, and that this means that there is no reason for us to believe this theory. It may be thought that this is a problem for the error theory, but I argue that it is not. Instead, I argue, our inability to believe the error theory undermines many objections that (...) have been made to this theory. (shrink)

Many philosophers claim that it cannot be the case that a person ought to perform an action if this person cannot perform this action. However, most of these philosophers do not give arguments for the truth of this claim. In this paper, I argue that it is plausible to interpret this claim in such a way that it is entailed by the claim that there cannot be a reason for a person to perform an action if it is impossible that (...) this person will perform this action. I then give three arguments for the truth of the latter claim, which are also arguments for the truth of the former claim as I interpret it. (shrink)

Many philosophers argue that the error theory should be rejected because it is incompatible with standard deontic logic and semantics. We argue that such formal objections to the theory fail. Our discussion has two upshots. First, it increases the dialectical weight that must be borne by objections to the error theory that target its content rather than its form. Second, it shows that standard deontic logic and semantics should be revised.

Frank Jackson has argued that, given plausible claims about supervenience, descriptive predicates and property identity, there are no irreducibly normative properties. Philosophers who think that there are such properties have made several objections to this argument. In this paper, I argue that all of these objections fail. I conclude that Jackson's argument shows that there are no irreducibly normative properties.

We argued that formal objections to the error theory overgeneralize and therefore fail. Christine Tiefensee and Gregory Wheeler deny this. We argue that they are wrong, for two reasons. The first concerns how we should adjudicate conflicts between formal and substantive commitments. The second concerns an overlooked tension between formal objections and non-error-theoretic views. Our discussion shows that the commitments behind formal objections to the error theory, such as the dual schema, should be regarded as much more contentious than is (...) often assumed. (shrink)

Terence Cuneo and Russ Shafer-Landau have recently proposed a new version of moral nonnaturalism, according to which there are nonnatural moral concepts and truths but no nonnatural moral facts. This view entails that moral error theorists are conceptually deficient. We explain why moral error theorists are not conceptually deficient. We then argue that this explanation reveals what is wrong with Cuneo and Shafer-Landau’s view.

Walter Sinnott-Armstrong argues that 'ought' does not entail 'can', but instead conversationally implicates it. I argue that Sinnott-Armstrong is actually committed to a hybrid view about the relation between 'ought' and 'can'. I then give a tensed formulation of the view that 'ought' entails 'can' that deals with Sinnott-Armstrong's argument and that is more unified than Sinnott-Armstrong's view.

Jonathan Dancy thinks that there are irreducibly normative properties. Frank Jackson has given a well-known argument against this view, and I have elsewhere defended this argument against many objections, including one made by Dancy. But Dancy remains unconvinced. In this chapter, I hope to convince him.

I have elsewhere given three arguments for the claim that there can be a reason for a person to perform an action only if this person can perform this action. Henne, Semler, Chituc, De Brigard, and Sinnott-Armstrong make several objections to my arguments. I here respond to their objections.

Some philosophers think that normative properties are identical to descriptive properties. In this paper, I argue that this entails that it is possible to say which descriptive properties normative properties are identical to. I argue that Frank Jackson's argument to show that this is possible fails, and that the objections to this argument show that it is impossible to say which descriptive properties normative properties are identical to. I conclude that normative properties are not identical to descriptive properties. I then (...) show that if we combine this conclusion with the conclusion of a different argument that Jackson has given to show that there are no irreducibly normative properties, it follows that there are no normative properties at all. (shrink)

Reductive realists about normative properties are often charged with being relativists: it is often argued that their view implies that when two people make conflicting normative judgements, these judgements can both be true. I argue that reductive realists can answer this charge by copying the quasi-realist moves that many expressivists make. I then argue that the remaining difference between reductive realism and expressivism is unimportant.

Jonas Olson writes that "a plausible moral error theory must be an error theory about all irreducible normativity". I agree. But unlike Olson, I think we cannot believe this error theory. I first argue that Olson should say that reasons for belief are irreducibly normative. I then argue that if reasons for belief are irreducibly normative, we cannot believe an error theory about all irreducible normativity. I then explain why I think Olson's objections to this argument fail. I end by (...) showing that Olson cannot defend his view as a partly revisionary alternative to an error theory about all irreducible normativity. (shrink)

Ulrike Heuer argues that there can be a reason for a person to perform an action that this person cannot perform, as long as this person can take efficient steps towards performing this action. In this reply, I first argue that Heuer's examples fail to undermine my claim that there cannot be a reason for a person to perform an action if it is impossible that this person will perform this action. I then argue that, on a plausible interpretation of (...) what 'efficient steps' are, Heuer's claim is consistent with my claim. I end by showing that Heuer fails to undermine the arguments I gave for my claim. (shrink)

Many philosophers think that normative judgements do not aim to represent the world. In this paper, I argue that this view is incompatible with the thought that when two people make conflicting normative judgements, at most one of these judgements is correct. I argue that this shows that normative judgements do aim to represent the world.

What is the relation between entailment and reasons for belief? In this paper, I discuss several answers to this question, and I argue that these answers all face problems. I then propose the following answer: for all propositions p1,...,pn and q, if the conjunction of p1,..., and pn entails q, then there is a reason against a person's both believing that p1,..., and that pn and believing the negation of q. I argue that this answer avoids the problems that the (...) other answers to this question face, and that it does not face any other problems either. I end by showing what the relation between deductive logic, reasons for belief and reasoning is if this answer is correct. (shrink)

To be able to say what practical reasoning is, we first need to say what reasoning is and what the conclusion of a process of reasoning is. I shall do this in sections 1 and 2. We can then make a distinction between practical and theoretical reasoning. There are three main ways to do this, which I shall survey in sections 3 to 5. I shall end by suggesting that there are different kinds of practical reasoning.

Quasi‐realists are expressivists who say much of what realists say. To avoid making their view indistinguishable from realism, however, they usually stop short of saying everything realists say. Many realists therefore think that something important is missing from quasi‐realism. I argue that quasi‐realists can undermine this thought by defending a version of quasi‐realism that I call super‐quasi‐realism. This version seems indistinguishable from realism, but I argue that this is a mistaken impression that arises because we cannot believe super‐quasi‐realism.

Derek Parfit, Philip Pettit and Michael Smith defend a version of consequentialism that covers everything. I argue that this version of consequentialism is false. Consequentialism, I argue, can only cover things that belong to a combination of things that agents can bring about.

Marianna Bergamaschi Ganapini argues that we can believe the error theory. In this reply, I explain why I still think we cannot.

There is a well-known argument against irreducibly normative properties that appeals to the following claim about supervenience: for all possible worlds W and W*, if the instantiation of descriptive properties in W and W* is exactly the same, then the instantiation of normative properties in W and W* is also exactly the same. This claim used to be uncontroversial, but recently several philosophers have challenged it. Do these challenges undermine this argument? I argue that they do not, since the negation (...) of this claim about supervenience has consequences that are much more implausible than the negations of key premises in these challenges. (shrink)

It is sometimes suggested that there are two kinds of reasoning: inferential reasoning and non-inferential reasoning. However, it is not entirely clear what the difference between these two kinds of reasoning is. In this paper, I try to answer the question what this difference is. I first discuss three answers to this question that I argue are unsatisfactory. I then give a different answer to this question, and I argue that this answer is satisfactory. I end by showing that this (...) answer can help to resolve some disagreements in which the difference between inferential and noninferential reasoning plays a role. (shrink)

I argue that Jackson, Stratton-Lake, and Schroeder’s objections to my arguments for the error theory in Unbelievable Errors fail. I also argue that our inability to believe the error theory should affect our assessments of these arguments.

In Unbelievable Errors, I defend an error theory about all normative judgements, I argue that we cannot believe this theory, and I argue that our inability to believe this theory makes the theory more likely to be true. This précis gives a brief overview of my arguments for the error theory and of my explanation of our inability to believe the theory.

A brief overview of metaethics, written for students.

Campbell Brown is right that my argument against semi-global consequentialism relies on the principle of agglomeration. However, semi-global consequentialists cannot rescue their view simply by rejecting this principle.

According to the error theory, normative judgments are beliefs that ascribe normative properties, but these properties do not exist. I have argued elsewhere (in "Can We Believe the Error Theory?") that we cannot believe this theory. Several philosophers have replied to this argument. In this chapter, I respond to their replies.

Many philosophers think that normative judgements do not aim to represent the world. In this paper, I argue that this view is incompatible with the thought that when two people make conflicting normative judgements, at most one of these judgements is correct. I argue that this shows that normative judgements do aim to represent the world.

Irrealism in Ethics is a collection of six original essays by prominent moral philosophers. The essays discuss various forms of ethical irrealism and present arguments for and against the two major versions of ethical irrealism: expressivism and the error theory.

In Unbelievable Errors, I defend an error theory about all normative judgments, I argue that we cannot believe this theory, and I argue that our inability to believe this theory makes the theory more likely to be true. This précis gives a brief overview of my arguments for the error theory.

I argue that Hattiangadi’s, Evers’ and Tiefensee’s objections to my arguments for the error theory in Unbelievable Errors fail.