School Shootings and EP?

Hi Y'all,
Do you have any thoughts about the school shootings, such as VT (Virginia Tech) from an evolutionary perspective? Not all the shooters were "crazy" but some had histories of being bullied or there was a lack of identity with a group (social identity). In other words, they were loners. I'd appreciate some feedback on this since there is nobody over here who thinks from an evolutionary viewpoint.
Best regards,
Mary Ann