As repugnant as the Nazi salute, let alone Nazi anything......it is free speech & imprisonment should never be spoken of.
Some folks see the Nazi salute and the KKK marches as hatred (which it is). I see it as FREEDOM! Same as the liberals marching with their signs and puppets. (All bets are off when it comes to illegally stopping traffic, broken windows or burning crosses on a black person’s property.)
Nazis murdered millions, including many Americans, during the 1930s and 1940s. They do not deserve a seat at the table of any "free speech" debate. They don't get to represent "the white race" any more than radical Islamists get to represent "the Arab race".
I'd happily tell them that Hitler was a punk, his views are perverse and anyone wishing to celebrate the man deserves prison.
Further, Trump needs to forcifully disown these people and condemn them as traitors to their race and to their country. The Left is going to try to continue to tar him with this alt-right crap until he denounces it more completely than he has up until now. Just like Obama had to disown Reverend Wright in order to have credibility with the rest of the electorate.