It seems somewhat odd to me that, instead of addressing possible mechanisms of this correlation, the authors talk about how bullying is an evolutionary trait to pass on genes.
Yeah, that’s why I want to get my hands on the study. Maybe the authors did consider that but the article is misrepresenting the study.
The study purports that bullies have more kids, not that people with more kids were/are bullies. It investigated the relation in one single direction, not both.