The media frequently claims that mass shooters are or were bullied as children. Does the scientific evidence back up this claim? Evidence that is reported in articles about this issue in major media outlets seems inconsistent. Scientific litterature also seems inconclusive.
Articles claiming there is a link
Inquirer: Many campus shootings have similarities. Studying them might prevent more tragedy, researchers say (limited to campus shootings)
Articles claiming no link
Statistics on Bullying and School Shootings (limited to school shootings rather than general mass shootings)
Newsweek: How we talk about bullying after school shootings can be dangerous (again, limited to school shootings)