Just the Facts with Gerald Posner

Just the Facts with Gerald Posner

The Internet Built These Killers

Two San Diego teenager shooters did not invent a worldview. They downloaded one.

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Gerald Posner
May 20, 2026
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Photo by Beatriz Reynolds on Unsplash

The two teenagers who opened fire at the Islamic Center of San Diego mosque left a 75-page manifesto that is the clearest and most chilling portrait yet of what online radicalization is doing to kids.

Eighteen-year-old Caleb Liam Vazquez of Chula Vista and 17-year-old Cain Lee Clark of San Diego livestreamed the attack to Discord. Their 75-page document contained both of their separate manifestos, with a title built like a flag: The New Crusade: Sons of Tarrant — a tribute to Brenton Tarrant, the white supremacist who slaughtered 51 Muslims in two New Zealand mosques in 2019.

These two boys did not invent a worldview. They inherited one — assembled, piece by piece, from the open sewer of the modern internet.

That is the part of this story that should keep parents awake. The *Sons of Tarrant* manifesto is not the work of a single ideology with a single grievance. It is, in every meaningful sense, the kitchen sink — every poisonous current of the last f…

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