The question I responded to is: "At least two thirds of the table is covered in various instruments of harm. What does that say to the viewer?" I maintain that "it says I'm supposed to hurt her" is not a rational answer. With the additional context that she usually hurts herself in these performances, it is understandable to have that thought, but not understandable or rational to act on it. I can think of lots of art that is intended to make you think about your capacity to hurt innocent people, but none that is intended to make you actually act on that.
Let me put it one other way: the commenter I initially replied to said that the presence of weapons on the table is useful context that should explain the actions of the audience members. I disagree, I don't think the presence of weapons is relevant at all or provides any amount of justification. I think the context you provided, that she usually hurts herself, is useful and does change my interpretation of her intent, but it still doesn't justify what anybody did. I still don't understand why somebody would choose to attack her. I also am a little bit skeptical that the audience would have been familiar with her other work. I'm not sure how the audience was chosen, but I don't believe the average person would have any idea who she was.