Less parental warmth and more harshness in the home environment affect how aggressive children become and whether they lack empathy and a moral compass, a set of characteristics known as callous-unemotional traits.
How parenting affects antisocial behaviors in children

A subsequent adoption study, of parents and children who were not biologically related, turned up consistent results.
Fuente: Science Daily, 11 October 2018.
Fuente: Science Daily, 11 October 2018.