Soon, We’ll All Be Radicals

If..."intelligence" reports described recent crimes and the people who perpetrated them, there would be little problem from a civil rights perspective, and it could actually be helpful to the average police officer. Instead, they have followed a "radicalization" theory popularized by the NYPD (PDF).

That theory postulates that there is a "path" to terrorism that includes the adoption of certain beliefs, and political, religious, or social activism is viewed as another step toward violence. Actual empirical studies of terrorism conducted in the Netherlands and Britain refute this theory, but the idea that hard-to-find terrorists can be caught by spying on easy-to-find activists appears too hard to resist to U.S. law enforcement.

It's happening here as well, regardless of "empirical studies".