Just what do you mean by rioting? So far Anti Trump rallies have been overwhelmingly peaceful. 

More examples of  right wing violence...How about "gay bashing", burning crosses on people's lawns, painting swastikas  on synagogues and mosques. What about the trolls who engage in  slurs and name calling on these very pages?
The alt right is instrumental of spreading lies and radicalizing hate. When you do that apparently what you get is "vulnerable people" picking up guns and killing other people for just being "other".