Noob here, and only read the article. It sounds strange since afaik some of the mentioned manifestations are full-blown disorders in the physiology, or at least work like that―namely psychopathy. Now, there would be no surprise if the conclusion was "you need to have less empathy if you gonna be evil," but apparently the scores don't depend on any single one of the manifestations.

Also weird for a research paper like this one to have its own site that looks like a startup landing page.