This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...gate any implication of moral sanction. When one deals with better people, a full statement of one’s views may be morally required. But in no case and in no situation may one permit one’s ow
n values to be attacked or denounced, and keep silent.
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Moral values are the motive power of a man’s actions. By pronouncing moral judgment, one protects the clarity of one’s ow
n perception and the rationality of the course one chooses to pursue. It makes a difference whether one thinks that one is dealing with human errors of knowledge or with human evil.