There is a recurring theme throughout the 2016 presidential campaign, particularly on the Republican side: "Be afraid -- be very afraid." It is enough to conclude American greatness lies in our historical rearview mirror. It is somewhat counterintuitive if one also accepts the myth of "American exceptionalism."
The Republican Party doesn't seem to understand the fact that threats to the United States originate from the actions of human beings. These human beings resort to violence when they are marginalized by society to the point where they believe that the only way to better their country is to work around the democratic system through violence.