I don’t think the author means to make a mental health diagnosis. He brings up the question at one point about whether a “bully” nature is a mental health issue

I don’t think the author means to make a mental health diagnosis. He brings up the question at one point about whether a “bully” nature is a mental health issue or an evolutionary adaption. The concept pointed to feels clear to me — a low percentage of individuals with a homicidal disposition and nature. Whether we use the term bully, sociopath, psychopath, or so on, what the article refers to seems clear and not an attempt at mental health diagnosis IMO.