Abstract

Are fanatical beliefs rational? This paper examines this question. After outlining two arguments for the rationality of fanatical beliefs, based respectively on what I call the "crippled epistemology" explanation and the "echo chambers" explanation, the paper rejects these arguments by appeal to considerations related to higher-order evidence. Then it explains what defending the rationality of fanatical beliefs actually requires. From this, it derives the practical conclusion that radicalization can be prevented and the growth of fanaticism stalled by preventing the encroachment of "fragile values."