“The Crash,” the latest aptly titled episode of “Mad Men,” is a runaway toboggan ride through the emotional wasteland of Don Draper’s psyche that’s been analyzed and dissected as much as the Zapruder film at this point. Love it or hate it, “Mad Men” has now entered the realm of myth with Don Draper doubling as an Orpheus-like tormented soul who has descended into the underworld under the illusion that he can reclaim his idealized woman (the mother he never had) only to discover ….