It's because right wing groups aren't considered terrorists in America.
Quote:In 2005, Congressional Quarterly obtained a sensitive Homeland Security report designed to focus DHS spending on the most serious threats, and found that it focused on "possible terror threats from radical environmental and animal rights activists" but omits threats posed by right-wing extremists."
The report stated that between 2005 and 2011 DHS expen "expects to contend primarily with adversaries such as al Qaeda," but also lists "left-wing domestic groups, such as the Animal Liberation Front (ALF) and the Earth Liberation Front (ELF), as terrorist threats." However, it "does not mention domestic extremist groups" or white supremacist groups like Aryan Nations and Army of God or anti-abortion activists, "which have previously been identified by federal officials as threats" and "which have staged numerous terrorist attacks that have killed scores of Americans."
Experts on domestic terrorism were "surprised the department did not include right-wing groups on their list of adversaries. ... James O. Ellis III, a senior terror researcher for the National Memorial Institute for the Prevention of Terrorism (MIPT), said ... that whereas left-wing groups, which have been more active recently, have focused mainly on the destruction of property, right-wing groups have a much deadlier and more violent record and should be on the list. 'The nature of the history of terrorism is that you will see acts in the name of [right-wing] causes in the future.
