2014 Isla Vista killings

The Christchurch massacre was built on existing far-right memes that fueled a live-streaming gunman's viral aspirations.
For lonely young men who are drawn into incel communities by the allure of camaraderie, it can be extremely difficult to find a way back out.
Alek Minassian's account vowed an "Incel Rebellion" and hailed California killer Elliot Rodger.