At the same time, insurrectionists posting on Parler and other social media seemed torn about whether to champion their sacking of the Capitol or blame it on antifa, one in a string of conspiracy theories the movement has embraced. Some adherents depicted Ashli Babbitt, the San Diego woman killed in the melee, as martyr for the cause. Others suggested she was an antifa plant — and claimed that no Trump supporters were involved in the ransacking.

“For the core participants and members of the far right, this has been a great success. This has been a milestone in their fight against these windmills, these alleged enemies of America,” said Arie Kruglanski, a psychology professor at University of Maryland and an expert in extremism. “On the other hand, it’s going to discourage those who aren’t quite as committed.”