The quote from Erik Larson's "The Devil in the White City" suggests that a psychopath prioritizes only their own desires and well-being, lacking any regard for the needs or values of others. This reflects a deep-seated selfishness that characterizes their behavior, indicating that they are willing to exploit or harm others to achieve their goals. Such individuals possess a chilling detachment from moral considerations, viewing relationships and societal norms merely as tools for personal gain.