While most of the world reacted with horror to the racist May 14 massacre at a Buffalo supermarket , one shadowy corner of the internet – the corner frequented by the accused gunman in the lead-up to his attack – continues to celebrate the murder of 10 Black people and goad each other to similar acts. One meme, a mock-up of the front page of the New York Daily News, shows a photo of Payton Gendron beside a series of bold-faced headlines, including “the mass shooter we’ve been waiting for” and “could you be next?” Another image imposes jokes over...