It seems preposterous in retrospect that a film as bigoted and noxious as “The Passion” had so many reverent defenders in high places in 2004. Once Gibson, or at least the subconscious Gibson, baldly advertised his anti-Semitism with his obscene tirade during a 2006 D.U.I. incident in Malibu, his old defenders had no choice but to peel off. Today you never hear conservatives mention their embrace of “The Passion” back then — if they mention Gibson at all. (Fox News has barely covered the new tapes.) But it isn’t just Gibson who has been discredited. Even as he self-immolated, so did many of the moral paragons who had rallied around him as a culture-war martyr…

The cultural wave that crested with “The Passion” was far bigger than Gibson. He was simply a symptom and beneficiary of a moment when the old religious right and its political and media shills were riding high. In 2010, the American ayatollahs’ ranks have been depleted by death (Falwell), retirement (James Dobson) and rent boys (too many to name). What remains of that old guard is stigmatized by its identification with poisonous crusades, from the potentially lethal antihomosexuality laws in Uganda to the rehabilitation campaign for the “born-again” serial killer David Berkowitz (“Son of Sam”) in America.

Conservative America’s new signature movement, the Tea Party, has its own extremes, but it shuns culture-war battles. It even remained mum when a federal judge in Massachusetts struck down the anti-same-sex marriage Defense of Marriage Act this month. As the conservative commentator Kyle Smith recently wrote in The New York Post, the “demise of Reagan-era groups like the Christian Coalition and the Moral Majority is just as important” as the rise of the Tea Party. “The morality armies have failed to inspire their children to join the crusade,” he concluded, and not unhappily. The right, too, is subject to generational turnover.