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Governing is hard enough without high officials resorting to the ''big slander.'' Interior Secretary James Watt does his administration no credit by wildly charging that environmental critics are trying to centralize the planning and control of society as the Nazis and Bolsheviks did. The absurdity of the allegation is self-evident. So is the political and moral damage which the White House suffers by continuing to tolerate such irresponsible talk by Mr. Watt.