The wild story put out by the Justice Department about an Iranian assassination plot smells suspiciously like something passed through a bull’s digestive tract. But the U.S. should hope that it’s true. Because it makes Iran’s fiercest terrorist organization look like blithering idiots.

According to the criminal complaint brought against Mansour Arbabsiar and his cousin, Gholam Shakuri on Tuesday, agents from Iran’s feared Qods Force, a buck-wild branch of the already buck-wild Revolutionary Guards Corps, plotted to assassinate the Saudi ambassador to the U.S. in Washington D.C. They might move...