Dalrymple leafs through Katherine Ramsland’s Inside the Minds of Healthcare Serial Killers (2007). The book turned out to be
mainly a descriptive compendium of cases, but as for explanation, I found it not.
Dalrymple asks:
Is serial killing by healthcare staff a single phenomenon, susceptible to a single explanation, when some do it for gain, others for thrills, yet others for sexual gratification, some for fame or notoriety, and some for no discernible reason at all?
He does not think so.
Explanation is a holy grail: no matter how long sought it is never found. We shall never explain human behaviour; we shall never cease trying to explain it.