Though Joe Biden’s debate performance last week was among the most painful things I’ve ever witnessed, it at least seemed to offer clarity. Suddenly, even many people who love this president realized that his campaign has become untenable.

For years, loyal Democrats have been suppressing their private anxiety about Biden’s decline. In the debate’s miserable aftermath, there was finally space to acknowledge the obvious: Biden is too old for this. “Not everything that is faced can be changed, but nothing can be changed until it is faced,” James Baldwin wrote. The Democratic Party’s predicament is an awful one, but there was a cold, flinty relief in being forced to reckon with it.

Since then, however, the Biden campaign has quickly moved to squash that reckoning, framing the divide in the Democratic Party as one between naïve, hysterical outsiders and savvy, resolute insiders. Biden surrogates fanned out to discount the debate as a single “bad night.” A campaign email slammed those calling on the president to step aside as the “bed-wetting brigade,” and offered tips for responding to “your panicked aunt, your MAGA uncle, or some self-important podcasters,” an apparent reference to the former Obama officials who host “Pod Save America.” On Monday, I listened to a recording of a Zoom meeting with Biden’s national finance committee in which his deputy campaign manager, Quentin Fulks, accused the media of blowing the debate “out of proportion,” and his campaign manager, Jen O’Malley Dillon, compared it to Barack Obama’s lackluster performance against Mitt Romney in 2012.

Some allies of the president have even suggested that Democrats learn from Donald Trump’s unswerving followers. “If Republicans are standing lock step” with the 78-year-old disgraced criminal Trump, said the MSNBC host Jonathan Capehart, “then Democrats damn well should be standing lock step with their ethical and morally decent 81-year-old president.”

I don’t blame people in the Biden camp for doing everything they can to tamp down an intraparty revolt. That’s their job, and I take some comfort that they’re doing it as well as is possible, since if Biden is the nominee, it’s imperative that he defeats Trump. But as long as there’s time to replace Biden, Democrats should not allow themselves to be bullied into fatalism and complacency.

More than a setback, Biden’s showing at the debate was a revelation, confirming the worst fears of his doubters. Since then, several news reports have made it clear that the Biden we all saw onstage is familiar to those who see him behind the scenes. Axios reported that, according to presidential aides, Biden is alert and engaged from 10 a.m. to 4 p.m., but not necessarily outside of those hours. The Wall Street Journal reported that European officials were worried about Biden’s “focus and stamina” even before the debate, “with some senior diplomats saying they had tracked a noticeable deterioration in the president’s faculties in meetings since last summer.” This is not a fixable problem.