The hysterical rioting mobs have, like so many others these days, isolated themselves completely within online and RL social bubbles where the EXTREME DANGER DANGER!!! (TM) of anyone voting for Trump is reinforced on a daily basis. It is logic on their part... but the sort of logic where several of the premises are wrong.
Those, specific, particular individuals engaged in the actual, specific rioting are naturally responsible for their own actions. They did so because they've hyped themselves up on irrational fear of anyone on the right, largely because they have no clue what the right actually believe or what little they do know they believe is subjected to extreme strawmanning. When you're a whiny, frightened person who thinks society's bout to end... no matter the actual reality, you're naturally going to freak out. Where have seen that behavior before...?
Pretending that that is just a leftist thing.. Dear god.

http://nymag.com/scienceofus/2016/03/fo ... essed.html
Is the violence the same on the left as on the right now? Nope. Had Clinton won, would Trump supporters have taken to the streets calling for revolution against an "illegitimate" president? Well, some of them have claimed they would. I consider the odds of that actually occuring close to nil, though.