WITH ALL THE WAR NEWS blaring from our TV sets, few Americans found time last week to mark the passing of 87-year-old Thor Heyerdahl. Yet his death haunts and accuses us, like a dagger pointed at our hearts. The great Norwegian explorer lived as few men dare to live in this effeminate age. Heyerdahl roamed the seas in primitive, handmade craft, as intimate with death as his Viking forebears had been. In 1947, he sailed more than 4,000 miles across the Pacific Ocean in a balsa-log raft named Kon-Tiki. He crossed the Atlantic in 1970, in a ship of reeds,...