"Adaptive error management theory [36] suggests that people will generally overestimate the potential dangerousness of strangers (reviewed in [22]) because the costs of false alarms are lower than the costs of mistaken attributions of harmlessness. Individual differences in trade-offs between the costs of false alarms and misses (as defined in signal detection theory [37]) in this domain may be reflected in individual differences in general trust. In other words, judges low in general trust might overestimate the psychopathy levels of most target individuals, but make more accurate judgments than high-trusters with respect to targets who are high in psychopathic traits."
"More trusting people are worse than less trusting people at detecting psychopathy in others, in the sense that their judgments deviate more from the self-described psychopathy levels of people they encounter. However, because more trusting individuals are reluctant to attribute callousness, dishonesty or manipulativeness to others based on limited information, they can presumably better reap the benefits of mutually beneficial cooperation in some social ecologies without paying the costs of psychopathy detection (see [55])."
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Weirdly, many people seems have mono-personality, too ''kind' or too ''harm'. But, because ''cognitive empathy'' advantage, ''too harm' people often can perceive better other people, than ''too kind'' ones, maybe a dilema ''predators/hunters versus preys''.
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