So long as they are not broken, the G.O.P. has two options. It can follow Flake’s lead and be a high-minded party of small-government principle, disavowing bigotry and paranoia — and it will lose elections, because purist libertarianism plus supply-side economics is not a winner in the current crisis.

Or it can follow D’Souza’s lead (and Trump’s, now that his populist agenda seems all-but-dead) and wrap unpopular economic policies in wild attacks on liberalism. With this combination, the Republican Party can win elections, at least for now — not because most Americans can be persuaded that liberals are literally Nazis, but because liberalism’s intolerant and utopian tendencies make people fear the prospect of granting progressives political power to match their cultural hegemony.

Winning this way is a purely negative achievement for the right, a recipe for failed governance extending years ahead.