The book "The Department of Sensitive Crimes" by Alexander McCall Smith explores the complexities of feline behavior, touching on the idea that cats can have inherently difficult personalities. The quote suggests that while some cats might have charming traits, others can exhibit troubling characteristics that reflect an unchangeable nature.

This perspective invites readers to consider that, much like people, cats can possess behavioral quirks that can be challenging to understand or manage. The assertion that cats are "psychopaths at heart" highlights the unpredictable and sometimes perplexing nature of these beloved pets, posing the question of whether we can truly influence their innate tendencies.