[Rockingham]

Or their reptile predator brain is dominant, which keeps the head still in order to be ready to pounce. As much as that sounds like a just so story, there are MRI scans that indicate that in psychopaths the empathetic areas of the brain are damaged due to lesions, with the brain adapting by relying more on the older reptilian brain for high level decision-making.

[Reeses]

there are MRI scans that indicate that in psychopaths the empathetic areas of the brain are damaged due to lesions

Or their genetics did not provide for a normal Homo sapiens sized prefrontal cortex. All wild predator animals are naturally psychopaths, the norm among meat eaters. Civilized adult humans are the exception rather than the rule.

For the first few seconds when you encounter a stranger, before you have other information to go on, properties like darker skin color are a pretty good warning indicator. Failure to recognize that pattern could get you killed.

Psychopaths are also easy to detect when they are driving a car. Do they give a damn about other drivers on the road?

[Varsity Flight]

Serpent