We may not like what he said while protesting, but all he did was peacefully protest, unless there is evidence he attacked someone.
I think what people are so upset about is that he was marching with, chanting with, and showing support for, two of the most hateful and vile of all domestic TERRORIST groups: the KKK and Nazis. And he traveled a long 500 miles to do it. This was not a 'casual' drive across town.
The Nazis of Germany in the 30' started as a very tiny group, too. And they were ignored. The rest is history. America cannot afford to ignore these terrorist crackpots. They have to be exposed in the clear light of day and, yes, identified for what they are.