The shooting reflects how extremist violence evolved after Christchurch — from fringe ideology into a decentralized online culture of memes, edits and mythologized mass shooters. Michelle Mildenberg for NBC NewsMay 31, 2026, 12:00 PM EDTBy Pilar MelendezThe San Diego duo responsible for a deadly mosque attack earlier this month were tweens in 2019 when a white supremacist livestreamed himself massacring 51 worshippers in Christchurch, New Zealand.Just a moment.We are getting your experience ready.