丹尼爾·希羅（Daniel Chirot），是美國華盛頓大學的國際研究與社會學教授，擔任東歐和西非的多個國際非政府組織的顧問。

剋拉剋·麥考利（Clark Mc Cauley），是布林毛爾學院（Bryn Mawr College）心理學教授，賓夕法尼亞大學的阿施（Solomon Asch）族裔政治衝突研究所主任。

Genocide, mass murder, massacres - the words themselves are chilling, evoking images of the slaughter of countless innocents. What dark impulses lurk in our minds that even today can justify the eradication of thousands and even millions of unarmed human beings caught in the crossfire of political, cultural, or ethnic hostilities? This question lies at the heart of "Why Not Kill Them All?" Cowritten by historical sociologist Daniel Chirot and psychologist Clark McCauley, the book goes beyond exploring the motives that have provided the psychological underpinnings for genocidal killings. It offers a historical and comparative context that adds up to a causal taxonomy of genocidal events. Rather than suggesting that such horrors are the product of abnormal or criminal minds, the authors emphasize the normality of these horrors: killing by category has occurred on every continent and in every century. But genocide is much less common than the imbalance of power that makes it possible. Throughout history human societies have developed techniques aimed at limiting intergroup violence. Incorporating ethnographic, historical, and current political evidence, this book examines the mechanisms of constraint that human societies have employed to temper partisan passions and reduce carnage. Might an understanding of these mechanisms lead the world of the twenty-first century away from mass murder? "Why Not Kill Them All?" makes clear that there are no simple solutions, but that progress is most likely to be made through a combination of international pressures, new institutions and laws, and education. If genocide is to become a grisly relic of the past, we must fully comprehend the complex history of violent conflict and the struggle between hatred and tolerance that is waged in the human heart.