The Antifa people burning a flag? They don't represent me nor do they represent the 20,000 other people who showed up at the Boston rally.
I support all those 20,000 or so citizens who took time out of their day to protest against white supremacy and hate groups.
It's too bad. I wouldn't want to associate with any group that suppresses and shouts down free speech.
The violent protestors burning flags, attacking police and old ladies and throwing urine don't represent all left-wing protestors. Of course, skinheads don't represent conservative protestors, either. There have been hundreds of Tea Party, and even "alt-right" (whatever that term means) protests with less violence than we saw in Boston over the weekend. Yet, the media paints the entire conservative movement like it's burning crosses.
By all accounts, those attempting to speak at the Boston rally were peaceful and rejected hate speech. Yet they were bullied into silence by a mob. I'm not sure that's something to be proud of. It's certainly not any more reflective of our American ideals than hate speech is.
You are assuming all the counter protesters were there protesting the handful of speakers that actually spoke at the rally.
I think this is a really bad assumption.
I think most people were there:
(a) protesting about what happened in Charlottesville (ie the white supremacists)
(b) protesting the KKK and other white supremacists they assumed would show up in Boston (but, as it turns out, didn't)
(c) protesting some of the people who they thought would show up (ie, Kyle Chapman, a white supremacist, was scheduled to speak in Boston).
I list a, b, c in order of why I think 20,000 people were there.
The 20,000 (or whatever the number was) were clearly not there protesting against free speech, per se. To suggest this is just to willfully ignore the reasons people state they are there, and/or to perpetuate a right wing myth that everyone on the left hates free speech.