The people most likely to believe in political violence may surprise you

A clash between Proud Boys and counterprotesters breaks out, in November 2020. Researchers say that the most socially connected people are more willing to say they’d use political violence.

Even before two people attempted to assassinate former President Donald Trump, national security experts and law enforcement were warning that the United States needed a plan to contend with the possibility of political violence on Election Day. 

Now, in the final weeks of the campaign, researchers...