The most direct response to a dangerous
conspiracy theories is censorship. That response is unavailable in an open society,
because it is inconsistent with principles of freedom of expression. We could imagine
circumstances in which a conspiracy theory became so pervasive, and so dangerous, that
censorship would be thinkable. But in an open society, the need for censorship would be
correspondingly reduced. In any case censorship may well turn out to be self-defeating.
The effort to censor the theory might well be taken as evidence that the theory is true, and
censorship of speech is notoriously difficult