Just two weeks ago, the US was the site of horrific terror. Two people were murdered in what appears to be a racially motivated shooting in Kentucky; members of a synagogue in Pittsburgh were the victims of what may be the deadliest anti-Semitic attack in US history; pipe bombs were mailed to prominent critics of Donald Trump. These acts of violence are not blips on the radar and they did not happen in a vacuum.

I’ve sometimes heard that there is no definition of terrorism. I wish somebody had told the Marine Corps this; as a young Lance Corporal I had to take a distance course on terrorism that included a written test that, among other things, asked for a definition of the term. It would have saved both young Lance Corporal Casberg and the Marine Corps time and energy if someone had the good sense to decide terrorism was