Those incidents were over 40 years ago. Meanwhile...
"...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).
"Since 9/11 extremists affiliated with a variety of far-right wing ideologies...have killed more people in the United States than have extremists motivated by al Qaeda's ideology."
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..."
http://www.cnn.com/2014/04/14/opinion/bergen-sterman-kansas-shooting/
"Below is a list of some of the right-wing extremist terror plots and violence from recent years.
July 27, 2008
Unemployed truck driver Jim David Adkisson opens fire on the congregation of a Unitarian Church in Knoxville, Tennessee, killing two people and seriously wounding six. Adkisson tells police he targeted the congregation because its members included gay men and mixed-race couples. ...
March 9, 2011
Kevin William Harpham is charged with attempting to use a weapon of mass destruction and receiving and possessing an improvised explosive device in relation to the attempted bombing of an Martin Luther King Day parade. According to the Southern Poverty Law Center, Harpham was previously a member of the National Alliance, an infamous neo-Nazi organization although it's unclear whether he's still a card-carrying member.
An individual identifying himself Kevin Harpham made several posting on the anti-Semitic website Vanguard News Network, including a March 2008 post to a VNN discussion titled, "Violent Revolution Against ZOG." [ZOG stands for "Zionist Occupied Government.]
(More here)
Lone Wolves: A Recent History of Violent Right-Wing Extremism | Blog | Media Matters for America