Disturbing revelations since the Annunciation Catholic School massacre paint a chilling portrait of Robin Westman as a deeply deranged young man who was by any yardstick a ticking time bomb — prompting many as-yet-unanswered questions about how such obvious warning signs were missed.

Westman, 23, had a sick fascination with school shootings and Adolf Hitler from an early age, and bounced between high schools as a teen while harboring suicidal feelings and saying he believed “life is pain.”

In his sprawling, crazed manifesto, scheduled to post on YouTube at the time of the killings, Westman voiced a lifelong admiration for mass murderers, particularly Adam Lanza, perpetrator of the 2012 Sandy Hook Elementary School shooting. 3

“Sandy Hook was my favorite, I think, exposure of scho

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