This book is an exhaustive treatment of the 1999 Columbine high school massacre, and its purpose is to dispel media narratives about the event and to identify the motives of the gunmen, largely constructed from their own admissions that were, until recently, shielded from public scrutiny.
There are weak points in the writing, not the least of which has to do with Cullen's pop-journalistic tenor; ironically, he castigates his colleagues for their sensational and wildly inaccurate reporting while at the same time indulging himself in obnoxious stylistic nuances, tailored to the faux-gonzo and unmistakeably bourgoisie convention found in desperate-to-be-relevant shitrags like ''Rolling Stone''. Aside from that however, his factfinding is impeccable and despite his obvious cosmopolitan prejudices, he directly assails the myth that the shooting was prompted by ''bullying'' or ''racism'' or ''anti-Semitism'' (he openly acknowledges Dylan Klebold's Jewish heritage) and in doing so smashes the liberal shibboleths that came to define the event in public memory.
Essentially, the story of Columbine is the story of Eric Harris. Harris was a popular, outgoing kid who loved weapons, managed to charm adult women into bed when he felt like it, and was by many accounts a genius. He began keeping a journal a year before the killings and he described that he had contempt for humans because they had abandoned rationality, and in doing so, had embraced a passive nihilism that was entirely devoid of anything compelling or dynamic. Harris determined that life was reducible to ''mathematics and chemistry'' and a perverted morality had taken root which had robbed man of an ability to develop or evolve in any ways but marginal ones, and that the only remedy for the problem would be catastrophic violence - which Cullen explains culminated in a bombing plot to destroy his high school at a moment when ''maximum human density'' could be isolated in a handful of the schools rooms during a lunch hour, at which time at least 500 people would perish (4 times the attrition of the Oklahoma City bombing). In other words, Harris' and Klebolds' shooting rampage was an ad-hoc backup plan that was implemented when Harris' IEDs failed to detonate.
Cullen's conclusion is that Harris was a typical psychopath who aimed to destroy a high school because it was a microcosm of America's demographic milieu and it would be a way to strike a blow against the corrosive stasis that Harris perceived to be at hand in the historical moment in which he found himself coming of age. He didn't have any peculiar animosity towards any of the individual students, and he didn't have any personal hostility to any of the boys or girls that he gunned down; he believed, rather, that they had to die so that a point could be made that could not be rationally explained to people that he determined were no longer capable of making sound judgments, uncolored by sentimental morality or supersition or dimwitted emotional responses. Cullen's opinion is that the reality of this motive so horrified FBI forensic psychologists and so befuddled moronic local police that they colluded in some way in allowing the media to present a narrative of ''bullying'', racialist ideology, negligent parenting or mental illness to explain away the killings.
Treatment of Dylan Klebold's motives is less interesting although just as complete. Klebold was the half-Jewish son of career academics who enjoyed a privileged life but never developed any meaningful perspectives on his life and world, other than myopic longings for unearned recognition and maudlin hostility over unrequited love. It becomes clear, according at least to Cullen's treatment of the evidence, that Klebold was simply suicidal and was taken with the charisma of Harris - who was by all accounts his only close friend. This may be dramatic license on the part of Cullen, so as to buttress his own narrative of events but what is telling is that Klebold apparently only fired between 5 and a dozen shots from his TEC-9 while his cohort was executing people with ruthless efficiency for over half an hour during the assault on the school.