Speech: A public figure or group disseminates violent, inflammatory rhetoric via mass-media, directed at people or groups of people, sometimes suggesting or legitimizing the use of violence.[1] This speech tends to be protected due to the use of ambiguous coded language, dog whistles, jokes, hints, and other subtext in statements that fall short of a criminal threshold for causation.[5][6][1][7] The 'it was just a joke' defense has been linked to early days of Nazism.[8] Other themes identified include black and white good vs. evil narratives[9] as well as painting an enemy as a mortal threat, which have been compared to the radicalization techniques used by terrorist groups.[10][11] These attacks are often repeated and amplified inside a media echo chamber.

https://en.wikipedia.org/wiki/Stochastic_terrorism