Psychopathy was linked to slightly lower intelligence, but "oppositional defiant disorder" showed the opposite trend. https://onlinelibrary.wiley.com/doi/10.1002/per.2207…
Other people's nonverbal signs of antipathy towards an unfamiliar third person are contagious. https://journals.sagepub.com/doi/full/10.1177/0146167219862616…
I was thinking of mimesis
Unfortunately I haven't read my Girard & thus dunno if my origin theories hold up
mimetic desire originates in it being easier to see another eating something than seeing food
sacrifice originates w/dropping one's baby to escape pursuing predators