From the Poway synagogue shooters manifesto. He gives a hat tip to the QAnon followers and 4Chan. "To the true anons out there (you know who you are). You are the product of /pol/—the product of unadulterated truth. You are my brothers and the best dudes out there."
Conspiracy theories do crazy things to people, and 4Chan is rife with them. My thoughts are with the victims of this horrid crime.