Boston was pretty peaceful for a rally of that size.
Or, let's even look at some of their non-peaceful events. Perhaps, one where they were
regarded as protectors by pacifist clergy about to be mowed over by Nazis, while the police stood idly by.
Antifa does vary from place-to-place. I mean, Portland Antifa, Berkeley Antifa, yeah, atrocious. Indisputably.
And no Antifa group necessarily claims to be pacifist. But that's not always bad, and sometimes it's even good, like with those who are protective or defensive as in the Charlottesville example.
But because each group is very different, and indeed, no actual group exists (Antifa is mostly composed of
other local groups who are working together for this specific timely issue, all the way from BLM to Redneck Revolt), they're all going to behave very differently.
I can't have a unified opinion of something that varies this much. "Antifa" is just the brand name of a specific cause, in which a huge variety of groups with a huge variety of MO's participate.