Again, the level of violence from the left in the US is amazingly low, like, historically so.
There isn't a single successful political movement in history who managed to achieve anything without any property damage happening along the way.
Demanding zero violence is demanding no direct action, which is why the right wing is demanding it, and if it won't be Antifa they will find someone else to vilify.
That is not to say that you need to support or engage in damaging properties, but if you generally agree with the causes that the left promote, the least you can do is not help propagate this right wing media caricature of the left which is designed to de-legitimize it and make people forget that one side has actual Nazis.
Adopting this bullshit narrative will not make Antifa change their way and it won't make Fox News stop declaring anything Democrats proposing as OMG COMMUNISM, and you think people who buy that "Antifa are the real fascists" bullshit are one "I condemn all violence from all sides" post on facebook from stop swallowing those stupid scare tactics?
The only purpose it has is to make you feel better about how you are "fair to both sides".
I'm sorry, but I don't agree. I think you can turn the argument around. By using violence (how little there might be from a historical standpoint) you de-legitimize yourself in my opinion and you risk to give credence to the caricature. You undo the work others have peacefully achieved.
Offcourse Fox won't stop attacking democratic proposals. But it will be a lot easier fighting their bullshit propaganda and hypocricy if we didn't offer them the violence they can abuse to strengthen their narrative. And no, you won't convince the hardcore right gobbling up Fox News, but the antifa violence and how right-wing media can abuse it, can alienate moderate people from your cause. Maybe we would still be talking about actual Nazi's if people weren't so stupid to throw piss at the police.
I can stand behind violence if democratic means are depleted or unreachable, but seriously, we are not in that situation by a long shot. I don't think the historic comparisons hold up too. Can you really compare antifa to the Indian independence struggle for instance?
And 20 pages into this topic, I still haven't seen any convincing argument for how smashing in windows will actually damage this administration or hurt the alt-right movement in any way. Again, if you are not fighting in a context of a massivly oppressive political system, if you are not attacked yourself when you protest, violence will get you nowhere, but a setback.
If you need violence to convince people of your political ideas, you are out of arguments and you invalidate your own cause imo. If you want to fight Nazi's and uphold democracy, you shouldn't use their scare tactics.