Silencing ideas or basking in intellectual orthodoxy independent of facts and evidence impedes our access to new and better ideas, and it inhibits a full and considered rejection of bad ones. From at least the time of Galileo, we can see how repressing seemingly heretical ideas has blinded societies and nations to the enhanced knowledge and understanding on which progress depend. Far more recently, we can see here at Harvard how our inattentiveness to the power and appeal of conservative voices left much of our community astonished – blindsided by the outcome of last fall's election. We must work to ensure that universities do not become bubbles isolated from the concerns and discourse of the society that surrounds them.
Universities must model a commitment to the notion that truth cannot simply be claimed, but must be established – established through reasoned argument, assessment, and even sometimes uncomfortable challenges that provide the foundation for truth. The legitimacy of universities' claim to be sources and validators of fact depends on our willingness to actively and vigorously defend those facts. And we must remember that limiting some speech opens the dangerous possibility that the speech that is ultimately censored may be our own. If some words are to be treated as equivalent to physical violence and silenced or even prosecuted, who is to decide which words? Freedom of expression, as Justice Oliver Wendell Holmes famously said long ago, protects not only free thought for those who agree with us but freedom for the thought we hate. We need to hear those hateful ideas so our society is fully equipped to oppose and defeat them.
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