When confronted by a range of violent actions perpetrated by lone individuals, contemporary society exhibits a constant tendency to react in terms of helpless, even perplexed horror. Seeking explanations for the apparently inexplicable, commentators often hurry to declare the perpetrators as evil . This question is not restricted to individuals: history has repeatedly demonstrated how groups and even entire nations can embark on a criminal plan united by the conviction that they were fighting for a good and just cause. Which circumstances occasioned such actions? What was their motivation?Applying a number of historical, scientific and social-scientific approaches to this question, this study produces an integrative portrait of the reasons for human behavior and advances a number of different interpretations for their genesis. The book makes clear the extent to which we live in socially-constructed realities in which we cling for dear life to a range of conceptions and beliefs which can all too easily fall apart in situations of crisis.