A year ago this month, President Donald Trump granted clemency to nearly 1,600 people responsible for the January 6 insurrection at the US Capitol. When Robert Pape, a University of Chicago political science professor who studies domestic political violence, heard about the pardons, he says he immediately thought it was “going to be the worst thing that happened in the second Trump presidency.”

The first year of Trump’s second term has been a blizzard of policies and executive actions that have shattered presidential norms, been challenged in court as unlawful, threatened to remake the federal government, and redefined the limits of presidential power. But Pape argues that Trump’s decision to pardon and set free the January 6 insurrectionists, including hundreds who had been found guilty of assaulting police, could be the most consequential decision of his second term.

“There are many ways we could lose our democracy. But the most worrisome way is through political violence,” Pape says. “Because the political violence is what would make the democratic backsliding you’re so used to hearing about irreversible. And then how might that actually happen? You get people willing to fight for Trump."