Yea. I wonder, does the lack of empathy automatically make one a psycopath in action, regardless of the range of mental capacity of other sorts.
From what I've been taught, it's not about a person's emotions but their thoughts that could make them psychopathic. Many people are apathetic, but few if any are manipulative.
Empathy, or the lack thereof, is actually considered a strong factor in psychopathologies. Empathy is in many ways a cognitive tool.
But expressing empathy is not a determining factor. Were that so, you'd see large portions of the population thought of or declared psychopathic when there is, in fact, no serious psychosis.
Logic failure. You assume that the fact that empathy is a strong factor in diagnoses of psychopathy means I'm stating it's the only important factor. Reparse and reconsider.
To quote an '08 abstract,
Recent advances in social neuroscience suggest a link between empathy and the mirror neuron system (MNS). Impaired empathy is one of the core diagnostic features of psychopathic personality disorder.