Donald Trump’s decision to withdraw the United States a second time from what is essentially the beacon of global culture and heritage – Unesco – is depressing but unsurprising given the administration’s lack of respect for art and culture that celebrates the diversity of humanity in all of its fullness. But it is still a grave error of moral leadership that harms the United States’ global standing on free expression, human rights and democracy. Earlier this year, he initiated a takeover of the Kennedy Center’s programming and content, and linked National Endowment for the Arts (NEA) and National Endowment for...