Artists and Writers Warn of an ‘Intolerant Climate.’ Reaction Is Swift.

The killing of George Floyd has brought an intense moment of racial reckoning in the United States. As protests spread across the country, they have been accompanied by open letters calling for — and promising — change at white-dominated institutions across the arts and academia.

But on Tuesday, a different type of letter appeared online. Titled “A Letter on Justice and Open Debate,” and signed by 153 prominent artists and intellectuals, it began with an acknowledgment of “powerful protests for racial and social justice” before pivoting to a warning against...