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Making peace, to be sure, is the proper goal of any President beset by war. But wars are as different as the men who fight them; their origins and their antagonisms vary, and the path to peace is seldom easy to find. Only the voice of the critic can be counted on with assurancea fact that Lyndon Johnson takes pains to point out to White House visitors these days, along with carefully documented historical references. But democratic tolerance for dissent has never yet impaired the U.S.'s ability to win its wars. "Protest," the President warned Hanoi last week, should not be counted upon "to produce surrender."