The US government stopped advocating violence based on the declaration you point to more than 70 years ago.
These people have NO idea...
I can't emphasize this enough: Nazis really are a violent group, and should be treated as such, like you would any other violent group like ISIS, Al Queda, MS-13, mafia, etc.
They absolutely aren't an academic concept on race relations.
The fact that someone was actually murdered at the Charlottesville rally, or that three Nazis were arrested after firing at protesters just last week in Florida should be enough evidence of their propensity towards violence.
I mean, seriously, what else do you need?
It seems a lot of people have no idea that Nazis are a violent group. To me that speaks a lot of white privilege, giving them the benefit-of-the-doubt.