The parasite is merely possessing an evolutionary niche. If there was not an ability to thrive in that niche, it would not exist. The same can be said with psychopaths. Whether our existence serves an evolutionary purpose or not, does not matter. What does matter is that in a prosocial world, a relatively small demographic dedicated to gain by any means necessary can thrive. Just as the mosquitos of the world fill a niche, psychopaths do the same. However, there is no sympathy for those products of nature that are seen as unclean or parasitic.
It is interesting to see what groups in the world are deserving of the empathy of the neurotypical. I’ve written innumerable times about the selective empathy of the neurotypical. Those that are most like her get her empathy. Christians are empathic toward other Christians; the poor lack empathy for the rich; the rich lack empathy for the poor; so on and so forth. What is interesting is that there is a universal lack of empathy for those without. Given that new research continues to suggest that psychopathy is genetic or heavily influenced during the formative years, it is hard for me to imagine how there couldn’t be empathy for the psychopath. People with Downs Syndrome or Multiple Sclerosis are deserving of empathy for their differences, why aren’t psychopaths?