And how is this a bad thing? Allowing hate groups "above ground" normalizes their behavior. They should be underground.
Extremist views are hard to fight when they are safely hidden away. Like any infection, it's best to expose them to the light of day. It's more effective to point and laugh than to throw projectiles and yell. (Had that strategy been employed in 1923, there would have been no Mein Kampf.)
How fascism was covered by the media http://www.smithsonianmag.com/history/how-journalists-covere...
The myth of political correctness https://thinkprogress.org/the-phony-debate-about-political-c...
What normalization looks like today https://lareviewofbooks.org/article/normalization-lesson-mun...
It doesn't gain them support. Putting their views in the spotlight demonstrates what sort of people they are, and helps combat them.
For example, the far-right British National Party had two seats in the European parliament from 2009-2014, but it didn't do them any good.
I want white supremacism die out, not white supremacist people themselves. I want their voice in the public dialogue. I want white supremacists to bring their ideology into the public sphere so that it can be visibly argued against. I want white supremacists to experience a change of heart.
Actually, ... yes. White supremacy used to be the norm. Slavery, lynch mobs, KKK, etc. all were considered normal. "To Kill a Mockingbird" was a book that talked about how normal such attitudes were (and still are in parts of the South)
White supremacy has been denormalized and it is dying says that continued denormalization does work.
In Durham, NC a confederate statue was pulled down. In the video, white people were seen abusing it. White people. That is what denormalization looks like.