Cullen and others dispute the theory of "revenge for bullying" as a motivation. While acknowledging the pervasiveness of bullying in high schools including CHS, Cullen claimed they were not victims of bullying. He noted Harris was more often the perpetrator than victim of bullying. In a fact check published on April 19, 2019, on the eve of the commemoration of the 20th anniversary of the massacre, Gillian Brockell in "The Washington Post" underscored that, contrary to the popular view, their attack was not revenge for being bullied.