Violence is a symptom of social unrest, not a cause.

Both sides in Charlottsville engaged in violent behavior, but that is where the comparisons end. The Neo-Nazi/KKK/white supremacists have a long history of violence and intimidation. For various reasons, the election of Trump has re-awakened their desires to go after Jews and non-whites. 

The rest of the country needs to stand up and resist these efforts. Ideally this can be done non-violently but humans are humans and often display aggressive behavior when threatened.