Earlier this month, a skirmish broke out on the American right between white nationalists and classical liberals. The white nationalists, calling themselves the “groyper army” (don’t ask), have been attending campus events organised by classical liberals in order to ask questions about “demographic replacement”, US support for Israel and the morality of homosexual acts – topics on which the two sides disagree.

Both sides, and most commentators, have emphasised these disagreements. But the most remarkable fact about the controversy may be the one point of absolute agreement: the value of free speech.