Actually those folks had good reason to riot as did those in the 60's.  It changed America for the good.  Rioting because of  the results of an election anywhere in American history is rare.
But the reaction to the recent election does not show burned businesses and riot torn streets such as you mention.  Again American are not rioting.  Upset?...yes. 

With that said, I despise Trump based on the campaign, But.. I am willing to take a "wait and see" approach. His bravado will change dramatically once he has to attend a mass shooting service or welcome a dead soldier home from a mission he ordered. He will be dealing with the lives of people every second of the day,  not people's money.  Trump's change will be profound, more so for his supporters.  Trump has seen "The Book" of secrecy concerning US security since the election and he has already changes his rhetoric.  What ever you think of him it must be overwhelming for him.  I pity anyone who becomes President.