Tyler Robinson had grown up, like many Americans his age, immersed in an irreverent, often baffling internet culture. When the 22-year-old etched messages on the shell casings later found alongside the rifle police said he used to kill Charlie Kirk, he chose a scattered mix of references: an Italian song used in a Netflix show, a bawdy remark about online role-play, a launch code from a sci-fi video game.

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