"Eighty-three percent of those murdered since 1975 were killed by the 9/11 terrorists...
Right-wingers are the second most common motivating ideology, accounting for 391 murders and 11 percent of the total. The definition here of right-wing terrorists includes those motivated by white supremacy, anti-abortion beliefs, involuntary celibacy (incels), and other right-wing ideologies.
Left-wing terrorists murdered 65 people, or about 2 percent of the total..."
https://www.cato.org/blog/politically-motivated-violence-rare-united-states