What is the main conflict in Without Conscience: The Disturbing World of the Psychopaths Among Us by Robert D. Hare?

Without Conscience: The Disturbing World of the The Psychopaths Among Us was first published in 1993 and was written by Dr. Robert Hare. Hare is a world renowned psychologist. Prior to his research and book, there were not a lot of procedures available to identify psychopaths. Many personality tests have been used, but Hare found them inconsistent and unreliable. Thus, Hare has developed, and in this book introduces, the Psychopathy Checklist.