‘Over the past several years, something has changed’

‘We study mass shooters. Something terrifying is happening online.’

James Densley and Jillian Peterson at The New York Times

Until “recently, if asked to profile a typical mass shooter, we would have described a middle-aged man who was socially isolated and in despair,” say James Densley and Jillian Peterson. But Americans “are witnessing the emergence of a different paradigm: a mass shooter no less despairing about life’s hardships but younger” and “highly connected to online social...