Nation Hate groups declined in 2021. But SPLC warns fringe ideology is going mainstream. March 9, 2022March 10, 2022N'dea Yancey-Bragg, USA TODAYComments Off on Hate groups declined in 2021. But SPLC warns fringe ideology is going mainstream. The Southern Poverty Law Center found hate groups were less active 2021 but partly due to extremist ideas becoming more mainstream.