Perhaps: Thresholds of violence: How school shootings catch on, by Malcolm Gladwell https://www.newyorker.com/magazine/2015/10/19/thresholds-of-violence https:

Perhaps: Thresholds of violence: How school shootings catch on, by Malcolm Gladwell https://www.newyorker.com/magazine/2015/10/19/thresholds-of-violence https://www.newyorker.com/magazine/2015/10/19/thresholds-of-... Gladwell interviewed about the article on National Public Radio’s Morning Edition: https://www.npr.org/2015/10/13/448182623/how-riots-may-help-us-understand-school-shooters https://www.npr.org/2015/10/13/448182623/how-riots-may-help-...