Six months ago, a gunman attacked two mosques in Christchurch, New Zealand, killing 51 people in the worst atrocity in the modern history of the country.
Months later, a man declared himself a “supporter of the Christchurch shooter and his manifesto” in an anti-immigrant screed and then murdered 22 people in El Paso, Texas.
And several other potential mass murderers have been arrested in the U.S. and New Zealand for attempting to carry out similar massacres bent on targeting a specific group of people.
