uncomfortable with this being the headline and seems like without further research this could just be one of those confirmation bias things. seems to make some assumptions that we don’t know empirically such as:
teachers in the 1980s were a good judge of character, fairly identifying who bullies whom
that this aggressive behavior at 10 years old continues meaningfully into later life
not denying the scientific accuracy of the study, but the journalist integrity of making this the headline.
edit: you can read the original article here, and yeah the actual text of the summary vindicates my judgment of the Guardian article. the original authors frame it as an analysis of “socio-emotional skills,” not agression per se, because again, these kids are ten, not even in high school yet.