In Genesis 6, … evil in the world is explained by angels cohabiting with women and producing a generation of rather rambunctious giants
– J. Harold Ellens, Introduction to Explaining Evil: Vol. 1: Definitions and Development (ABC-CLIO, 2011): p. 5.
Explaining Evil is a 3-volume set: (Vol. 1) Definitions and Development; (Vol. 2) History, Global Views, and Events; and (Vol. 3) Approaches, Responses, Solutions.