A terrorism expert in 2005 predicted a massive attack on Las Vegas. But he got the killer's race wrong.

Upon hearing the grievous news out of Las Vegas Sunday night, I thought immediately of a prediction I had once read that just such an attack would someday strike the entertainment capital of the world.

The prediction had come from a former high-level counter-terrorism expert named Richard Clarke (above). He had seen it all coming: the mass killer on a suicide mission, the law enforcers unaware of his existence, the psychic gut punch to America's sense of safety that this orgy of violence was...