Andrea, Peikoff addressed this a bit on pages 285-286 of OPAR and similarly Ayn Rand wrote an essay titled “How Does One Lead a Rational Life in an Irrational Society” (in “The Virtue of Selfishness”).I believe both were saying that you have no obligation to reveal your thoughts to others if you as the dissenter are “in the power of the irrational” and doing so would risk your career, income, school grades, etc. Otherwise, if your silence would be taken as agreement with something you think is wrong, you should at least say “I disagree”.
