Dylan Roof supported the neo national socialist & white supremacist movement, and decided one day to shoot up a historically black church. He was charged for everything that he did, which is correct. However, Neo national socialists didn't order or take credit for his attack on the church- he acted on his own, even though he flew the white supremacy flag.
He acted on his own, independent of the movement or organization that he followed. Were there white supremacists that support him? yes. Were there white supremacists that think what he did was horrible? yes. However, the movement of white supremacy isn't responsible for what he did.
This same exact thing applies to antifa. So far, there is no evidence that antifa made the decision or order to carry out the attack on Milo's supporters. Until then, antifa cannot conceivably be held responsible for it. Those who perpetrated the crimes, however, can be, and they should by all means.
Alright for example so a group of bikers known as the Hell's Angles go to some establishments to protest. Only a handful on their own members blow up the building and kill a bunch of people.
Is it not a terrorist group if they didn't organize the bombings?
If they didn't organize the bombings, they are not a terrorist group. If antifa didn't organize the
violence, keyword violence, that ensued at the event, they are not a terrorist group.
If 100 antifa people go to protest and 20 of them decide to go on a shooting spree, those 20 that committed the crime should be charged. If the 80 that didn't ordered them to do it, they should be held responsible for ordering it. However, if those 80 didn't have anything to do with the shooting, they should be let go, since they didn't commit a crime. This is what justice is- arresting people who commit crimes, not arresting people because they believe in the same ideology as the criminals.