‘We’re here; we’re deadly; get used to it’

The jihadists among us, taking a page from the successful radicals in the gay liberation movement, are no longer hiding their agenda. Most people understand a conspiracy theory to exist in a realm where disparate, unrelated facts slot into a person’s monomania to create a threat manifest only to that person. In this realm, the most persuasive evidence is the absence of evidence. The mere fact that no one has ever seen a secretive Jewish cabal nor read the cabal’s “plan” for world domination is, in itself, proof to the monomaniacal antisemite that such a plan exists. But is it...