Caleb Cain was a college dropout looking for direction. He turned to YouTube.
Soon, he was pulled into a far-right universe, watching thousands of videos filled with conspiracy theories, misogyny and racism. "I was brainwashed.
Caleb Cain pulled a Glock pistol from his waistband, took out the magazine and casually tossed both onto the kitchen counter. "I bought it the day after I got death threats," he said.
The threats, Mr. Cain explained, came from right-wing trolls in response to a video he had posted.