I don't know enough about neo-Nazis to argue with your characterization, though I can see your point re. their marginalization. But I suspect there was a time when people viewed German Nazis in the 1920's the same way. Hitler et al.'s biographies aren't exactly paeans to success. So one problem "we" (those of us who aren't neo-Nazis or white supremacists) wrestle with is this: do we indeed ignore them, hoping they will go away? Or do we counter their views, risking building them up into a "worthy" opponent, in order to make it clear that there's no place for such views in the US? And I don't have an answer.

And just as I for one don't lump all conservatives and neo-Nazis together, I don't think your characterization of BLM and Antifa is fair. Like conservatives, they are loosely-knit groups, not organizations like the ACLU or Heritage Foundation. Ergo, it's not fair to blame violence committed in their name with the many non-violent people who support their goals.