Off the top of my head:
Electorally
-Obviously, win back the White House
-Most importantly, this will allow us to get an attorney general, FBI director, and DHS heads that will prosecute far right terrorism to the furthest extent possible.
-More focus on elected positions that impact the justice system, particularly in local politics. Wealthy democratic donors should create a fund for backing challengers to, say, the top 10 most racist Attorneys General and Sheriffs. A little money goes a long way in these races, and like the tea party, once they're successful they can just use the threat of backing a challenger to gain leverage. This will make it more likely that local law enforcement will take crimes committed by the far right seriously, even in deep red territory.
Non-electorally
-Antifa should invest in drones for the next rally (Sept 11 at Texas A&M seems to be the next big one). Get face pictures of as many people there as possible, and turn what that one twitter account is doing into an operation, employing volunteers and paid staff (if we can get some donors for this) to identify the people who are at the rally and notify their family, employers, etc.
-Doxxing has been an underutilized tactic for antifascist efforts so far, I believe - in particular, emphasis should be placed on outing a few rank and file Stormfront and far right reddit accounts to make it clear no fascist is safe.
-Continue with massive counter-protest wherever far right rallies are held. Particular emphasis should be placed, for those who are willing to take the risk, of baiting the enemy into violent confrontation that is nevertheless unambiguously the Nazi's fault. We want them to be Bull Connor, unleashing violence on clearly peaceful protesters. We should be disciplined in not allowing the heat of the moment or the lust for revenge to cause us to sacrifice our long-term goals.
Obviously there's a lot more that could be done and is being done.. These are just a few examples of how, I hope, you can see that nonviolence doesn't mean passively letting the Nazis do what they want.
Your turn. How does violence fix this problem? Be specific, please. How do you think bombing the Texas A&M rally is going to go? Assassinating Richard Spencer? If you don't actually want to become a terrorist, how does cathartically punching Nazis and brawling with them on college campuses advance our agenda?