What is a Witch?

I am reading „The Witch-Hunt in Early Modern Europe” by Brian Levack, a Professor of History.
At the same time I am reading, „Satan's Silence: Ritual Abuse and the Making of a Modern Witch Hunt” about the California pre-school child sex-ring prosecutions in the 1980's. And at the same time still, I am reading, „The Mask of Sanity: An Attempt to Clarify Some Issues About the So-Called Psychopathic Personality” by Hervey Cleckley, a Clinical Professor of Psychiatry.
There is a common thread that runs through these three books that I am attempting to unravel. Before there were psychopaths (people presently diagnosed with anti-social personality disorders) there were witches. According to Dr. Levack, people accused of witchcraft were almost always the ones who exhibited anti-social behavior in the communities where they were being accused. And it is the same today, at least according to „Satan's Silence”, where it was people who behaved „odd” who were first accused of ritualistically molesting children. If the accusations stuck, then they were quickly diagnosed with anti-social personality disorders and labeled psychopaths.
There are many more similarities between how society labels and hunts psychopaths with how society once labeled and hunted witches, enough to easily fill a book. But my hope is to only understand this insanity for myself; that is presuming of course that such insanity can even be understood.