It is believed that the hijackers chose to crash the plane, rather than be taken alive.
A lot has been said about this event, especially in the last ten years. There is a new World Trade Center near the site of original structures that were lost when they burned. So much has been written in books (fiction, non-fiction) and portrayed in movies that certain aspects of the tragedy are now a part of our social fabric. According to some, "The War on Terror" has become a permanent feature of 21st Century life. Decades after the fact, U.S. forces in Afghanistan and Iraq are...still there.
The international community cannot reach a consensus, nobody seems to have a workable solution for the factionalized terrorism that has since swept the globe.
There is more than one kind of extremism at work in the world today, all of it has roots in our past. You'd think we could be capable of learning from all of our well-documented mistakes. Okay, well. That's what I'd like to believe. I'm still of the opinion that we can make the future we want. That, or we will get the future we deserve.