Misunderstandings about the criminal propensities and treatability of individuals achieving high scores on measures like the PCL-R have been perpetuated by professionals who interpret such high scores in a stereotypic manner, without considering nuances or issues of heterogeneity. A key message of our review is that classical psychopathy, whether measured by the PCL-R or other measures, is not monolithic; instead, it represents a constellation of multiple traits that may include, in varying degrees, the phenotypic domains of boldness, meanness, and disinhibition. Measures such as the PCL-R that do not directly assess features of low anxiety, fearlessness, or boldness more broadly tend to identify heterogeneous subgroups of individuals as psychopathic. As a consequence, efforts to apply one-size-fits-all public policies to psychopathic individuals may be doomed to failure. In aggregate, these conclusions may help to shed light on what psychopathy is, and what it is not, and to guide policy interventions directed toward improved public health and public safety.