The Evil Within: Why We Need Moral Philosophy explores the profound ethical dilemmas faced by historical figures such as Thomas Jefferson and Edward Coles, illustrating how similar backgrounds can lead to drastically different moral choices. Diane Jeske delves into the justifications that people use to rationalize their actions, whether they are morally wrong or even evil. Through a series of case studies examining Nazi death camp commandants, American slave-holders, and a psychopathic serial killer, she reveals how cultural norms, the complexity of consequences, emotions, and self-deception can impede effective moral deliberation.

Jeske’s work is not merely academic; it serves as an extended real-life thought experiment, highlighting the mistakes we make in our own moral reasoning. By applying the tools of moral philosophy to these cases, she demonstrates how we can become more adept at identifying and correcting such errors. The book challenges readers to confront uncomfortable parallels between the ethical struggles of notorious figures and their own justifications for actions that may seem questionable.

With 296 pages of insightful analysis and practical applications, The Evil Within offers a compelling argument for why moral philosophy is essential in our quest for wisdom and ethical clarity. This thought-provoking exploration into the nature of evil and its justification serves as both a warning and a guide for navigating the complex landscape of morality.

Published by Oxford University Press on September 3, 2018, with ISBN-13: 978-0190685379, this book is a must-read for anyone interested in understanding the depths of human moral failing and the potential of philosophical inquiry to address these challenges.