Gray Zone: Watching Shoot

Q1. When reading Ward's article, I found it very interesting that no one called the police when the shooting occurred. Usually when someone is shot, people around the incident render it necessary to call the police, but in this case since it was considered art, no one called the police. Does that make it okay to not call the police just because it is art? Did the viewers have a responsibility to call the police? 

Q2. I understand that Burden had his friend shoot himself because he wanted the public to place themselves into his shoes while simultaneously speaking to the Vietnam War, but is what he did ethical? Is it okay to shoot someone for the sake of art? Was shooting himself the only way to get the point across or that there another way to get his point across without bloodshed?