They have every right to protest- and when they cross the line into illegal acts, they should be arrested and charged.
THIS APPLIES TO ALL SIDES- If you apply it to those supposed Trump supporters, you have to apply it to the Liberals and anarchists as well. The rule of law does not make exceptions ( Umless you are a Hillary supporter.)

" like instigation of hate and distrust against a massive majority of the American population " LIKE THOSE who voted for Trump?