The vast complexities of a dangerous world were cast in too-simple terms in the latest Republican presidential debate. Chris Christie pledged to make common cause with a Jordanian king who's actually dead and Rand Paul wrongly stated that all terrorist attacks in the U.S. since 2001 have come from the hands of legal immigrants. Jeb Bush said "We need to embed our forces, our troops, inside the Iraqi military." The U.S. is already doing that. And on and on...