For most Americans, even most conservatives, yesterday’s deepest causes are often quietly forgotten. Consider that by Reagan’s definition, all other industrial democracies are tyrannies. Yet every year, the right-wing Heritage Foundation ranks several of these countries — such as Switzerland — as “more free” than the United States, despite the fact that they have universal health care.

For many conservatives, the “rot” to be excoriated is not about economics and health care but about culture. A persistent theme of conservative intellectuals and commentators — in print and on Fox News — is the cultural decay of the country. But compared with almost any period in U.S. history, we live in bourgeois times, in a culture that values family, religion, work and, above all, business. Young people today aspire to become Mark Zuckerberg. They quote the aphorisms of Warren Buffett and read the Twitter feed of Bill Gates. Even after the worst recession since the Great Depression, there are no obvious radicals, anarchists, Black Panthers or other revolutionary movements — save the tea party.

For some tacticians and consultants, extreme rhetoric is just a way to keep the troops fired up. But rhetoric gives meaning and shape to a political movement. Over the past six decades, conservatism’s language of decay, despair and decline have created a powerful group of Americans who believe fervently in this dark narrative and are determined to stop the country from plunging into imminent oblivion. They aren’t going to give up just yet.