Since 9-11, the U.S. government has poured millions and millions of dollars into research on terrorism and political violence. Most of it has gone to major research universities where major social scientists work. What they have produced so far is either what was already known or trivial. As an example of both, consider the recent report from
START(National Consortium for the Study of Terrorism and Responses to Terrorism). This pathbreaking work reveals “a violent history of fatal attacks against law enforcement officers in the United States by individuals who adhere to far-right ideology.” Far right ideology consists of “principles such as fierce nationalism, anti-globalization, suspicions of centralized Federal authority, support for conspiracy theories, and reverence for individual liberties (including gun ownership ).”
Addendum: Here is the link.