Defending Direct Source Incompatibilism

Abstract

Joseph Keim Campbell has attempted to say “farewell” to a particular version of source incompatibilism, viz. direct source incompatibilism, arguing that direct source incompatibilism is committed to two theses that are in tension, thereby threatening the coherence of the position. He states that direct source incompatibilism is committed to the following claims: SI-F: there are genuine Frankfurt-style counterexamples. SI-D: there is a sound version of the Direct Argument. Campbell argues that both of these theses cannot be simultaneously held since a sound version of the Direct Argument would undermine Frankfurt-style counterexamples, and vice versa. After laying out Campbell’s argument, I will first make some preliminary comments regarding actual direct source incompatibilists and their commitment to SI-F and SI-D. I then object to Campbell’s argument, arguing that one can accept both SI-F and SI-D, thereby vindicating direct source incompatibilism from the charge of incoherence.