The U.S. Anti-Defamation League attempts a broader count, stressing murderers’ links with far-right organizations rather than their stated motives. According to the group, right-wing extremists were responsible for 70 percent of the 427 extremist-related killings that occurred in the U.S. in the past 10 years. In 2018, every one of the perpetrators of the 37 extremist-related murders in the U.S. had ties to at least one far-right movement, although one had recently switched to supporting Islamist extremism, the ADL says.

Importantly, the number of incidents of violence perpetrated by the far right is on the rise. The Institute for Economics and Peace noted in its 2018 Global Terrorism Index report that the number of such killings increased from three in 2014 to 17 in 2017.

Meanwhile, Islamist-inspired terrorism appears to be on the wane, with the attempt to create a caliphate in the Middle East roundly defeated and the ideal of pure Islamic statehood losing its attractiveness to the assorted misfits among the West’s Muslim minorities. According to Jane’s Terrorism and Insurgency Center’s Global Attack Index, fatalities linked to Islamic State declined by 51.5 percent in 2018.