In regard to the "ring wing gun nuts" who haven't shot anyone . . . consider the gun nut Bundy followers who in 2014 shot and killed two police officers in Las Vegas:

"The Las Vegas Sun reported that residents of the apartment building where the Millers lived said they 'had a reputation for spouting racist, anti-government views, bragging about their gun collection, and boasting that they’d spent time at Cliven Bundy’s ranch during a recent standoff there between armed militia members and federal government agents.'"

Violent extremism, whether anarchist, liberationist, reactionary, fascist, racist or just plain crazy, is still violent.