In a nation of at least 310,000,000 Citizens, the number of White Nationalist cretins out there is minimal, including all the biker gangs, Nazi party members, skinheads and KKK members, and that number has declined since 2011, and way down since Democrats honored the KKK openly, many years ago. Far fewer than 10,000 people in total, by SPLC estimates.
California seems the most plagued with such people, and 20 odd states have groups registered, sending out newsletters, etc., tracked by SPLC last in 2016.
Such groups are known, investigated, and jailed when authorities can find reason and are dangerous, admittedly if one wishes to confront such people, but a minimal part of life in the United States. Certainly not worth the ink they get in MSM recently.
Antifa and BlackLivesMatter, and other extreme left groups are a far bigger issue and worry, with 43% of Democrats offering support for such people, and their aims, and these groups are not only growing, but becoming more militant and blatant in their threats and actions. Law enforcement is well aware of this issue, and should be giving more resources to removing these actors from our day to day lives. These are worldwide groups in their actions, and fun raising, and need curbing especially in their fund raising efforts, and shaming of those who support such bigotry.