One of the greatest dangers to the crew of a ship that has lost its bearings is also one of the most tempting: the water all around them. As the stores of freshwater run out, and the thirst sets in, the ocean and its contents look ever more inviting. But that way leads to death. A gulp of saltwater may relieve a parched throat for a moment, but it makes the thirst stronger and the body weaker. The only cure is the pure water that sustains life.  As with sailors, so with societies. A people that loses its sense of purpose and direction risks losing the great hearts and sharp eyes needed to regain its bearings. A society awash in Jew-hatred is headed for ruin, and Wednesday’s terrorist attack in Washington reminds us that the United States is such a society.