Twin tower was demolished

Perhaps a better title would be the “twin towers were demolished”, because my opponent claims that the collapse of both towers of the world trade center were the result of a controlled demolition on 9/11/2001. To decide which hypothesis is the most likely one we have to ask ourselves three questions: “How?” “Who?” and “Why?”. Here is the official story that I support: How? Two jet-fuel filled airplanes hit the towers. American Airlines flight 11, a Boeing 767, hit the North Tower at 8:46:30. http://www.youtube.com... (You can hear the plane and if you watch closely you can see it too, even though it is very fast. Because it was unexpected, there is not much footage of the first hit.) United Airlines flight 175, also a Boeing 767, hit the South Tower at 9:03:02. http://www.youtube.com... The South Tower collapses at 9:58:59. The North Tower collapses at 10:28:22. http://en.wikipedia.org... Who? Flight 11 was hijacked by Mohamed Atta Abdulaziz al-Omari Waleed al Shehri Wail al Shehri Satam al-Suqami http://en.wikipedia.org... Flight 175 was hijacked by Marwan al-Shehhi Feyed Banihammad Hamza al-Ghamdi Ahmed al-Ghamdi Mohand al-Shehri http://en.wikipedia.org... These hijackers were members of al-Qaeda. The attack was ordered by Osama bin Laden. Why? Osama bin Laden declared a holy war against the united states http://en.wikipedia.org... “Declaration of War against the Americans Occupying the Land of the Two Holy Places” His hatred against the USA comes from his objection to USA involvement in the middle east. My opponent answered “How?” (controlled demolition), but not “Who?” and “Why?”. The collapse does not look at all like a controlled demolition. In a controlled demolition, the whole tower falls, destroying the first floor, then the second floor etc. But in the twin towers, the floors crumbled from the floor of impact downwards. Were the alleged explosives on the exact same floor as the impact of the planes? If it was a controlled demolition, the demolition and the planes had to be coordinated. If one is going to make a controlled demolition, why bother flying two planes in the buildings as well? This does not make any sense to me. Please explain. Rebuttals: PRO: “The material of the twin towers is ejected outwards from the collapse zone and is not piling or stacking up like you would expect from a progressive collapse.” Why would you expect that? PRO: “The building self implodes from top to bottom , all the material is turned to dust so where does the energy come from to crush the building below it while self imploding into dust in an outward manner.” If it turns into dust it would still have the same weight. It is also not obvious to me that all the material is turned to (fine) dust. There is a big dust cloud, so we cannot really see what is happening inside the cloud. PRO: “If gravity caused the collapse of the building sending shockwaves down the building pulverising material outward then how come in you can see the sections of the building self imploding themselves at a faster rate than gravity as would be expected from a gravitational collapse.Notice the right hand side of the building Seconds 29 -35” How fast did you expect it to implode? Can you show some calculations and give us the assumptions you base these calculations on? I am looking forward to my opponents explanation, who made the alleged controlled demolition, and why. And also his explanation how the airplanes and the demolition were coordinated.