9/11 as Avant-Garde Art?

Extract

[The attacks of 9/11 were] the greatest work of art imaginable for the whole cosmos. Minds achieving something in an act that we couldn't even dream of in music, people rehearsing like mad for 10 years, preparing fanatically for a concert, and then dying, just imagine what happened there. You have people who are that focused on a performance and then 5,000 [sic] people are dispatched to the afterlife, in a single moment. I couldn't do that. By comparison, we composers are nothing. Artists, too, sometimes try to go beyond the limits of what is feasible and conceivable, so that we wake up, so that we open ourselves to another world. … It's a crime because those involved didn't consent. They didn't come to the “concert.” That's obvious. And no one announced that they risked losing their lives. What happened in spiritual terms, the leap out of security, out of what is usually taken for granted, out of life, that sometimes happens to a small extent in art, too, otherwise art is nothing.

—Karlheinz Stockhausen (“Documentation”)

Stockhausen aside, how can anyone call the 9/11 attack on the Twin Towers a work of art? Of what value is such a designation? What does calling the destruction of the Twin Towers a work of art assert about (performance) art, the authenticity of “what really happened,” and social morality during and after the first decade of the twenty-first century? To even begin to address these questions, I need to refer to the history of the avant-garde—because it has been avant-garde artists who for more than a century have called for the violent destruction of existing aesthetic, social, and political systems.