In fact, since 9/11 extremists affiliated with a variety of far-right wing ideologies, including white supremacists, anti-abortion extremists and anti-government militants, have killed more people in the United States than have extremists motivated by al Qaeda's ideology. According to a count by the New America Foundation, right wing extremists have killed 34 people in the United States for political reasons since 9/11. (The total includes the latest shootings in Kansas, which are being classified as a hate crime).
By contrast, terrorists motivated by al Qaeda's ideology have killed 21 people in the United States since 9/11.
(Although a variety of left wing militants and environmental extremists have carried out violent attacks for political reasons against property and individuals since 9/11, none have been linked to a lethal attack, according to research by the New America Foundation.)
Is anyone susprised by this?