I think it is the latter. Note how the stories all talk about violence between Trump supporters and protesters. But when you look at the pictures you see law enforcement officers or Secret Service agents fighting with protesters. How can Trump be blamed for a bunch of protesters fighting with the Chicago police when the rally was cancelled and Trump wasn't even there?
And by the way, Femen protesters intentionally violate norms of society and disrupt events in order to bring attention to an issue. They are far more like the protesters crashing Trump rallies than they are like the Trump supporters and Trump himself who are just trying to have a political rally. And the Femen protesters expect the response they get, and they aren't the victims, they are the perpetrators.
But ordinary feminists have paved the way for the "femens" by being rude, crude and uncouth in their behavior. Just as Trump has normalized insults and verbally encouraged uncouth behavior and physical contact. Such as "I'd like to punch him in the face, I'll tell you that" . . . and the Trump supporter then punching a protester in the face.
The radicals - from their point of view - are simply responding in kind. They have gone over the top into conspiring to disrupt a private event, not to mention the violence that Dimassimo apparently had on his mind. And merely setting a tone in no way justifies that criminal conduct. But it is still setting a tone.