Susan Bro recognized the palpable anger and open bigotry on display in the mob that attacked the United States Capitol this month. It reminded her of the outpouring of hate that killed her daughter, Heather Heyer.

That was in 2017, when white supremacists, self-avowed neo-Nazis and right-wing militias marched on Charlottesville in the name of intolerance — and former President Donald J. Trump — and one of them drove a car into a crowd, fatally injuring Ms. Heyer. More than three years later, Ms. Bro and other Charlottesville residents say they have a message for the nation after the latest episode of white violence in Washington, and for President Biden, who is emphasizing themes of healing and unity in the face of right-wing extremism.

Healing requires holding perpetrators accountable, Ms. Bro said. Unity follows justice.

“Look at the lessons learned from Charlottesville,” she said. “The rush to hug each other and sing ‘Kumbaya’ is not an effective strategy.”

The Capitol attack and Mr. Trump’s handling of it felt eerily familiar to many residents of Charlottesville, where the 2017 Unite the Right rally not only forever tied the former president to violence committed by white extremists, but also inspired Mr. Biden to run for president and undertake “a battle for the soul of this nation.”

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Local leaders say this is the legacy of the “Summer of Hate,” as the white supremacist actions and violence of 2017 are known in Charlottesville. When the election of Mr. Trump and the violence that followed punctured the myth of a post-racial America, particularly among white liberals, these leaders committed themselves to the long arc of insulating democracy from white supremacy and misinformation.

“We were the canary in the coal mine,” said Jalane Schmidt, an activist and professor who teaches at the University of Virginia and was involved in the 2017 activism. She compared the current political moment to the aftermath of the Civil War, framing the choice for Mr. Biden’s administration as either committing to sweeping change akin to Reconstruction or going along with the type of compromise that brought its end.

“We have a whole major political party that, too large of a section of it, supports undemocratic practices, voter suppression and the coddling of these conspiracy theories,” Dr. Schmidt said, referring to Republicans. “So healing? Unity? You can’t do that with people who don’t adhere to basic democratic principles.”