When law enforcement officials failed to anticipate that pro-Trump supporters would devolve into a violent mob, they fell victim to what one expert calls "the invisible obvious." He said it was hard for authorities to see that people who looked like them could want to commit this kind of violence. Roberto Schmidt/AFP via Getty Images hide caption toggle caption Roberto Schmidt/AFP via Getty Images When law enforcement officials failed to anticipate that pro-Trump supporters would devolve into a violent mob, they fell victim to what one expert calls "the invisible obvious." He said it was hard for authorities to see that people who looked like them could want to commit this kind of violence.