That number is more than the 21 people killed by militants motivated by al-Qaeda 's ideology in the United States in the post-9/11 era . Peter Bergen : Shooters in Las Vegas murders had extremist , anti-government views . Comment: Since 9/11 , more have died in far-right violence than Islamic terrorism , Bergen says . Bergen : Authorities should pay more attention to the threat posed by homegrown extremists .
Peter Bergen : Shooters in Las Vegas murders had extremist , anti-government views . Comment: Since 9/11 , more have died in far-right violence than Islamic terrorism , Bergen says . Bergen : Authorities should pay more attention to the threat posed by homegrown extremists .