It's kind of inciting terrorism when you look at the actual definition of terrorism. Well that is saying recently. It used to be a lot more vague.  Per the FBI website on a quick duck duck go search: "Domestic terrorism: Perpetrated by individuals and/or groups inspired by or associated with primarily U.S.-based movements that espouse extremist ideologies of a political, religious, social, racial, or environmental nature.   --for example, the June 8, 2014 Las Vegas shooting, during which two police officers inside a restaurant were killed in an ambush-style attack, which was committed by a married couple who held anti-government views and who intended to use the shooting to start a revolution."