As far as I know, every single western civilised country forbids violence. Assault is illegal in the US, right ?
Also, since we are talking about freedom of speech, what about the freedom of speech of these protestors ? As long as they are just peacefully protesting Trump, why would they be denied their Freedom of Speech ? How can a presidential candidate refuse to grant freedom of speech to certain people, just because they do not agree with him ?
It can be absolutely peaceful under an absolute tyrant.
I'm pretty sure I can walk the streets of Pyongyang and not have to worry about being mugged, even without my minders.
Nope. You'll be quickly spotted and arrested by police. Then they would torture you untill you confess being an american spy. Then they'll execute you, in public. And they'll send the tape of your confession and your execution to CNN.
Only tyrannies legalise government violence on its own citizens and on foreigners.