among the 27 fatal terror attacks inflicted in this country since 9/11, 20 were committed by domestic right-wing extremists. (The other seven attacks were committed by domestic jihadists, not by foreign terrorist organizations.) Of the 77 people killed in these 27 incidents, two-thirds died at the hands of anti-abortion fanatics, “Christian Identity” zealots, white anti-Semites, or other right-wing militants.
http://www.slate.com/articles/news_and_politics/politics/2015/11/robert_lewis_dear_is_one_of_many_religious_extremists_bred_in_north_carolina.html