Radicalization

The 18-year-old gunman accused of a deadly racist rampage at a Buffalo supermarket seems to fit an all-too-familiar profile: an aggrieved white man steeped in hate-filled conspiracies online, and inspired by other extremist massacres. Payton Gendron of Conklin, New York, appears to have been driven to action roughly two years from when his radical indoctrination…