If Trump were merely proposing a border wall and the more aggressive employment of tariffs, we would be engaged in a debate, not facing a schism. Both President Ronald Reagan and President George W. Bush played the tariff chess game. As a Republican presidential candidate, Mitt Romney endorsed the massive “self-deportation” of undocumented workers without the rise of a #NeverRomney movement.

But it is blind, even obtuse, to place Trumpism in the same category. Trump’s policy proposals — the details of which Trump himself seems unconcerned and uninformed about — are symbolic expressions of a certain approach to politics. The stated purpose of Trump’s border wall is to keep out a contagion of Mexican rapists and murderers. His argument is not taken from Heritage Foundation policy papers. He makes it by quoting the racist poem “The Snake,” which compares migrants to dangerous vermin. Trump proposes to ban migration from some Muslim-majority countries because Muslim refugees, as he sees it, are a Trojan-horse threat of terrorism. Trump’s policy ideas are incidental to his message of dehumanization.

So how do we split the political difference on this one? Shall we talk about Mexican migrants as rapists on every other day? Shall we provide rhetorical cover for alt-right bigots only on special occasions, such as after a racist rally and murder?