Why do people think 911 was a controlled explosion?

I've heard this rumor but I don't know what to think about (tons of demolition videos where people say "you forgot the most famous demolition -_-). People say that there is no way that the buildings could have collapsed as fast as they did or collapsed at all. Here is my theory: (some is research some is reasoning) From research, I have found that the fires reached 900 degrees, steel melts at 1500, even so, steel starts to lose strength at 500. Even at 600 degrees, it still would lose its strength, which would make sense because when the planes struck, the jet fuel began to melt the beams. Even though the temperature was not as high as needed, due to where the planes struck (93rd and 99th floors) and (77th and 85th floors) the partially melted and weakened steel would already have the weight of the top stories (the buildings were 110 stories) bearing down on the floors with damaged structural integrity. I had seen a special that said the heat from the jet fuel melted the beams. the levels than began to collapse on each other. With the added from each floor, as the building collapsed, the buildings most likely gained speed and caused a domino effect. The steel must have also been weak enough since the top of one of the towers fell of well it was collapsing.This just my theory, what is your opinion?

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The conspiracy theories are based entirely upon the TV footage of that day showing the towers collapsing.Their main points are:1: Spectators heard "explosions" before the (outside) of the towers collapsed.2: Steel must melt before it can be deformed, or fail.3: The towers fell straight down, similar to how other controlled demolition of other buildings 4: The towers fell "too fast".However their conclusions are based on incomplete information, assumptions, and in some cases, a complete lack of understanding of science and engineering.For instance, the "explosions" was actually the sound of the steel bolts that held the floors to the central core, snapping. Yes, it does sound like a "bang" or a gunshot so I can certainly understand people saying they heard something that sounded like several explosions, however that does not mean they ACTUALLY heard explosions.The heat from the fire softened - but did not melt - the steel beams and bolts holding the floors up. When one floor's bolts failed, the floor fell straight down...and onto the one below it. Even if the lower floor wasn't damaged, the impact was too much for it, and its bolts failed as well. It's important to note that the exterior of the towers was not structural. It was literally a skin of thin plates of glass and aluminum. So the floors started falling inside before the outside fell. Conpsiracy theorists concluded - incorrectly - that the outside of the towers simply started falling at free-fall speeds instead of slowly accelerating. However that acceleration had already occurred inside and the outside merely went along for a ride.The pancaking of the floors is also why the towers fell mostly straight down, instead of toppling over. The entire plaza was bombarded by flaming debris from the towers, which damaged several other buildings nearby - including the infamous building 7, which eventually collapsed due to the added weight of having thousands of tons of steel fall on it.If anything, the conspiracy theorists and their "research" only prove why it is so important to remain completely objective during an investigation. Assumptions will only cloud our judgement.

Other Answers:

• You are correct on your theory...conspiracists tried to do damage to Bush by trying to make people think the US pulled it off to have an excuse to attack terrorists. We didn't need an excuse since we'd been attacked around the world for a decade before 9/11. So it's all political and failed to gain traction.
• The heat generated by the impact of the plane into the building was in excess of 1000 degrees. As the fuel leaked out of the plane upon impact, the gas created a blanket of combustible oil that lit the floors on fire and seep through the floorboards down to the lower levels. The eating away of the wooden ceilings and cardboard floors put stress on the steel beams, weakening their solidarity and, in effect, causing them to bend inward on each other and collapse.
• That is a pretty nice sounding theory. However, I believe that if that were the case, the buildings would not have come down as neatly as they did. After all, the there was more fire on one side of the buildings than the other, and parts of the building had been burning slightly long than other parts. Therefore, the steel in areas of the building that were where the fire began, and therefore had been on fire the longest, would have weakened first. Then of course the steel that had not been exposed to flames as long would have weakened next. The buildings all came down at once. And next to consider is the fact that there is a large group of architects and engineers that believes those buildings were imploded. I have seen up close and personal the implosions of large buildings. I used to live in Las Vegas, and it seems like once or twice per year, an old casino gets imploded to make room for a new one. As someone who has witnessed that, I can say that the 9/11 buildings coming down look very much like implosions. I won't make accusations, because I am no expert, but they sure look like old casinos going down.
• The other contributors above have explained the Twin Tower collapses. People often suggest Building 7 was a controlled explosion because of the way it came down. The problem is most people have only seen the footage of Building 7 from one angle, this viewpoint does not show the extensive damage and uncontrolled fires in the building. It is reasonable to assume those fires could bring down the building, and no evidence at all of controlled demolition. But you will always have people spinning the collapse of building 7 using selective video footage to support their assumption, and ignoring the other video of fires and damage to the building.
• Because there some intelligent people who had seen the truth [ yes it was a CONSPIRACY
• Controlled demolition was the only way three buildings could come down perfectly like that. Tower 7 came down the same way and it was not even hit by a plane.