In America, "proximity and shared values" is all it takes to turn protesters into felons

Way to have the point sail over your head. It’s not just that the dressed the same, or that they had similar beliefs, or that some of them smashed up stuff. It’s all of that. They dressed to make it difficult to identify them individually (“who smashed the window?” " guy in black with a bandanna over his face and a hood up"). This isn’t women wearing pussy hats. This is deliberately conspiring to make it difficult to identify and arrest those responsible for crimes.

Once you’ve entered a conspiracy, you’re responsible for everything done by members of the conspiracy. (Conspiracy: the agreement to commit an illegal act, and the commission of an action (legal or not) in furtherance of the conspiracy). And since black bloc protests nearly invariably result in violence and property damage, merely becoming part of the protest is that agreement.

Seriously, the comparison to the Klan isn’t far fetched. Unless you do believe that you shouldn’t arrest all the guys in white robes at a cross burning.