Whether te French revolution, Ferguson Mo, or anti trump, the left ALWAYS resorts to violence.
I remember a quote from a movie, but not the name of the movie. If I remember correctly the quote was by H. G. Wells, a character in the movie.
"The first to resort to violence is the first to abandon reason." or something close.
The Left is severely short on reason in their views to start with.
Next thought is that unless the other side quickly responds with violence, the first party will likely win.