The letter addressed the nationwide Black Lives Matter protests and calls to defund the police — acknowledging that the demands are over due while warning against cancel culture and being intolerant of differences.
"But this needed reckoning has also intensified a new set of moral attitudes and political commitments that tend to weaken our norms of open debate and toleration of differences in favor of ideological conformity," the letter read. "The democratic inclusion we want can be achieved only if we speak out against the intolerant climate that has set in on all sides."
The letter warned that liberals are forming their own version of censorship, one that President Donald Trump and "right-wing demagogues" thrive off of.
"This stifling atmosphere will ultimately harm the most vital causes of our time," the letter added. "The restriction of debate, whether by a repressive government or an intolerant society, invariably hurts those who lack power and makes everyone less capable of democratic participation."