In the year after the deadly U.S. Capitol attack, the number of active hate groups in the United States has continued to decline, but the popularity of extremist ideas that fueled the insurrection still poses a threat to democracy, according to an [annual report from the Southern Poverty Law Center](javascript:void(0);) released Wednesday. The law center, which tracks racism, xenophobia, misogyny and antigovernment militias, found 733 active hate groups operating in 2021 — down from the 838 identified last year. The amount of hate groups has been steadily declining since hitting the record high of 1,020 in 2018. Antigovernment groups, which...