Joshua Stanton, writing at his One Free Korea, says:
To protest against Trump’s election isn’t unfair, but it is undemocratic. When Trump cast doubt on his acceptance of the election result in the last debate, pundits questioned his patriotism and raised concerns that his supporters would resort to violence. Now that the shoe is on the other foot, who is unpatriotic now? No matter how great a threat you may think Trump is to the republic, he won fairly under the rules established by the Constitution. These people are really protesting the outcome of a peaceful, free, constitutional election. By refusing to accept the result and reacting (in some cases) with violence, the protestors have become the undemocratic mobs they accused Trump and his supporters of being. And if Trump is really the authoritarian they fear he is, the left’s violence would be his best possible justification to fulfill their darkest fears.
But the glass-breakers, the arsonists, the vandals, and the fight-starters aren't listening. That's because they're all dirty hypocrites.
The whole dissent-and-patriotism issue has become a running joke in US politics over the past several election cycles. Is it patriotic to defy the will of the government and/or the will of the people? It depends on whom you ask, and on when you ask.