The credo of liberal science imposes upon each of us two moral obligations: to allow everybody to err and criticize, even obnoxiously, and to submit everybody’s beliefs—including our own—to public checking before claiming that they deserve to be accepted as knowledge. Today, activists and moralists are assailing both halves of the creed. They are assailing the right to err and criticize, when the error seems outrageous or the criticism seems hurtful; they are assailing the requirement for public checking, when the result is to reject someone’s belief. They have a right to pursue their attack
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