No matter how I look at it, I can’t foresee any positive outcome from the coming round of dueling demonstrations in Portland. The far right is going to come away from it all feeling even more bitter and aggrieved, and even more justified (in their own minds) in using violence.
If Portland Antifa obliges the right-wingers’ wish and attacks first, and/or attacks non-fascists (and they might, given that multiple instances of past behavior indicate the presence of hotheads in that group), then of course there will be more grievance.
But suppose the right-wingers attack first (which is at least as likely), then what? The same thing, of course. That they started it will be irrelevant; a narrative, supported by the right-wing media, contrary to the facts will be developed. The quality of any evidence will be irrelevant. Video footage, for example, can easily be selectively edited to make aggressors look like the attacked.
Perhaps the best possible outcome would be something which, like Charlottsville, clearly exhibits the violence and depravity of the poliical right, and thus serves to further alienate moderates from it and Trump. (Let’s hope it will not be as violent and deadly as Charlottsville.) But even in that case, the right will walk away feeling that they are the ones being wronged, and as a result escalate their rhetoric and tactics (see above).
This is, at best, the end of the beginning. In no way is it the beginning of the end.