Using the insider lingo of the community, Henderson closed his post with a sign-off, “Remember keep jakking ‘teens,” followed by the website’s emblem, an octopus-like creature wrapping its tentacles around the globe. The emblem was accompanied by the slogan, “Nothing is beyond our reach.”
Henderson is one of three teenage attackers who have carried out shootings — and in one case a knife attack — over the past six months that extremism researchers have linked to a subset of the Soyjak community known as the Soyjak Attackers Video Fandom, or SAVF.
In the hours after Henderson’s school attack, investigators at the Anti-Defamation League’s Center on Extremism monitored discussions among the anonymous users on the Soyjak website.
“We watched as they started panicking about losing their website out of fear because they believed the Antioch shooter had been groomed to carry out the shooting by their imageboards,” Carla Hill, the center’s director of investigative research, told Raw Story.
Henderson was a Black teenager whose writings revealed a deep immersion in white supremacist ideology. His consumption of extremist content appears to have manifested as a loathing for himself and other Black people, as he grappled with personal difficulties.
Henderson also identified with the involuntary celibate, or incel, movement, whose members blame women and society for their lack of romantic success.
The title of Henderson’s screed combined the two ideas by marrying a racial slur against Black people with the suffix “cel,” adding a parenthetical to explain that he was an “involuntary” Black person.
“We felt like the Antioch shooter was driven to self-loathing by what he saw online,” Hill said. “That’s how he came to be a self-hating person.”
Other terrorist attacks — such as the car-ramming recently carried out by an ISIS sympathizer in New Orleans and the 2019 mass shooting by a white supremacist at a Walmart in El Paso, Texas — have proven to be significantly more lethal, but Henderson’s attack has unnerved extremism researchers as a harbinger of an emerging hybrid threat that is harder to pin down.
Hill took notice of three intertwined “driving forces” behind Henderson’s attack.
“There’s the incel space — various incel spaces — we found him in those. Soyjak crosses over with that,” Hill said. “Then, he was in spaces that glorify violence and gore and school shooters. Third, he was in these reactionary imageboard sites like Soyjak that serve as a hub for all kinds of extremist discourses, including antisemitism, accelerationism, white supremacy and misogyny.”
Through his participation in overlapping fringe internet subcultures where members use multiple social media platforms to celebrate white supremacist mass murder, dabble in the occult and engage in degrading interpersonal drama, Henderson connected online with 15-year-old Natalie Rupnow, who fatally shot a fellow student and teacher before taking her own life in Madison, WI, in December.
And Henderson took inspiration from an 18-year-old Turk named Arda Küçükyetim, who carried out a knife attack at an open-air café near a mosque in August. Rupnow participated in an online group that held a pre-arranged viewing party to watch Kücükyetim carry out the attack on a livestream.
Küçükyetim and Rupnow were also “part of” the Soyjak Attacker Video Fandom,” according to a report written by two pseudonymous authors and published by Marc-André Argentino, a senior researcher at the Accelerationism Research Consortium.
A screed left behind by Ryan Palmeter, a 21-year-old white supremacist who fatally shot three Black people in a Dollar Store in Jacksonville, FL in August 2023, also bears the imprint of the Soyjak community. A graphic included in Palmeter’s document includes a Soyjak character known as Chudjak, who is said to have been inspired by Patrick Crusius, the El Paso shooter. The word “soy” is emblazoned across Chudjak’s T-shirt in the graphic. The reference caught the attention of Henderson, who referenced him in his writings as a “soyteen,” the term that insiders use to describe a member of the community.
Similar to Palmeter, Henderson and Küçukyetim published screeds in advance of their attacks that celebrated previous white supremacist shootings, reviewed their meticulous planning and gear, and provided encouragement to readers they hoped would emulate their actions. (Rupnow also engaged in this ritualistic practice, but it’s unclear what she wrote because she left her Google document on private before taking her own life.)
As part of an iterative effort to promote accelerationist violence calculated to bring about the collapse of society, Henderson and Küçükyetim’s posts shared one specific facet: They recommended documents produced by the Terrorgram Collective, which was recently named as a specially designated global terrorist entity by the U.S. State Department.
Terrorgram first emerged in 2019 and, within a couple years, coalesced into a tight-knit group that produced PDFs with highly stylized graphics that combine terrorist propaganda, white supremacist hate, and tactical guidance. Terrorgram’s propaganda venerates white supremacist mass murderers by calling them “saints.”
Terrorgram’s publications function like a virus that finds a receptive host in fringe online extremist communities such as Soyjak, and then infects individuals who attack society at large through mass shootings and other lone-actor violence.
Henderson shared instructions on how to perpetrate attacks on social media from a Terrorgram Collective publication, among others, according to Argentino, and links to three of the publications appear in his screed.
Küçükyetim, meanwhile, shared PDFs of three Terrorgram publications on Telegram, according to a federal indictment of two Terrorgram Collective leaders. Dallas Humber of Elk Grove, CA, and Matthew Allison of Boise, ID, the Terrorgram leaders, were arrested less than a month after Kücükyetim carried out his attack. Humber and Allison were indicted on 15 counts, including conspiring to provide material support for terrorists, and could face up to 220 years in prison if convicted.
On the morning of his attack in the northwestern Turkish city of Eskisehir, according to the Humber/Allison indictment, Küçükyetim posted in a Telegram group chat: “Come see how much humans I can cleanse.” The post included links to a livestream and PDF files of the Terrorgram publications.
Hill and her team at the Anti-Defamation League’s Center on Extremism found the group chat. A Telegram account they identified as Natalie Rupnow's joined the chat through an invitation, which meant that she had been connected somehow to the other members of the chat prior to the livestreamed attack, Hill said.
Hill told Raw Story that Rupnow participated in a post-play discussion to evaluate the merits of the attack. Rupnow remarked that Küçükyetim had been “caught” and that the death toll was “0 probably,” but that he deserved “credit” for at least trying.
Humber and Allison also took note of the attack.
“He included the Terrorgram books and other Saint manifestos in his file dump, gives shoutouts to the other Saints in his manifesto and references several Hard Reset passages, he was 100% our guy,” Humber wrote in a chat with Allison, according to the indictment.
“But he’s not white, so I can’t give him an honorary title,” she added. “We still celebrating his attack tho, he did it for Terrorgram.”
When Rupnow posted her screed on X before opening fire at Abundant Life Christian School in Madison, WI on Dec. 16, Henderson replied under the post: “Livestream it.”
Later that day, after the attack, he expressed excitement that “the newest skool shooter followed” him on two of his X accounts.
In his diary, Henderson appears to speculate that he may have influenced Rupnow.
“It’s weird how we had similar takes and views, but not really because she followed my account,” he wrote.
“Arda was right!” Henderson added. Then he quoted directly from Küçükyetim’s screed: “Remember, I and the other saints will not forget what you did…. In this way, you will motivate future saints.”
It’s not clear whether Henderson directly interacted with Küçükyetim. In his diary, Henderson described Küçükyetim as “an ultimate saint” and “someone I was inspired by,” while cryptically adding, “maybe I didn’t know him.”
The transfer of terrorist motivation and camaraderie in each of the attackers’ screeds is part of a negative feedback loop, along with group chats and other social media posts, that is ensnaring some teenagers who are globally linked to one another through the internet.
“It’s not like a conversation in real life where if I told you something crazy you would be like, ‘Wait a minute,’” Hill said. “It’s an echo chamber that allows anything to go. They’re not getting healthy feedback. It builds on things that trouble them, and causes real-world problems.”
The proliferation of accelerationist terrorism through online radicalization is a challenge that law enforcement is not equipped to handle alone, she said.
“It’s going to take everyone,” Hill said. “It’s going to take parents talking to kids about how what you see on the internet could be false and horrible. And the tech community somehow trying to stop the spread of this.”
This story is the first in a three-part series exploring how violent online subcultures provide the opportunity for teenagers attracted to accelerationism and inceldom to network and encourage one another to carry out terrorist attacks.
