Yeah, Antifa at this point is more trouble than they are worth. When I talk to otherwise reasonable people, I lose them a lot when they bring up Antifa; I can reduce them to the few, actually violent members who are causing the trouble -- I can explain that that violence doesn't represent the majority, and I can even go into the virtues of violence *behind* the message if they want to play some kind of zero-sum game on this from a moral standpoint, but it is getting really hard to break through on certain talking points that forward leftist ideals with the noise of their example. And you can say "Oh, well, we don't need to convince these people", but yeah, we actually do. They vote.
So yeah, Trevor is right. I don't want him to be right, but Antifa is hurting a very important message which the left has always tried to forward.
Edit: I want to be clear, I am not even remotely trying to draw any comparison between what Antifa does in general, or even in their extremes, to anything else -- I am talking about the difficulty it poses me and presumably others when trying to communicate, and persuade, that we're not in the wrong. It is hard enough without violence as a talking point others can toss your way.