No planes crashed into the World Trade Centers, or the Pentagon, or in (I believe it was ) a Pennsilvania (sp) field? They however fail to explain the cell phone calls made to loved ones from the people who were on the non-existant planes who told their loved ones that they were being hi-jacked and in one case that they were going to try and retake the plane. Are you saying these people called and lied to their loved ones as part of a conspiracy just so they could disappear and never be heard from again? Now that is stretching credulity beyond belief.
The impact of planes into the World Trade Centers did not immediately bring down the towers because they were stongly built. The steel girders had fire resistant material on the outside of them. However when the planes struck the buildings the force of the crash along with the explosion of the fuel tanks blew off a good portion of this fire retardant material and the subsiquent inferno inside the buildings heated the steel girders to a point that they no longer could support the weight they were designed to hold up (i.e. the girders began to sag because the heat weakened the beams). This took time and as you can see from the videos that show the secondly hit tower, it collapsed first. This is because it was hit lower than the first and more weight was above the compromised girders than in the firstly hit tower which collapsed later due to the same effect (i.e. not as much weight above the compromised girders therefore it took longer before the beams gave way). I watched a show on (I believe it was ) The Discovery Channel that covered this, and more, concerning the impact, fire and finally collapse of the two towers. And, YES, I am inclined to believe the engineers who did the analysis on the show. To me it made sense because there was a Logical Progression of Events that fit with the engineered design of the buildings.
The stretching and twisting and innuendo supplied by the Conspiracy Theorists takes snippets of information and construes them into an evil plot. They assert that because every little quirk is not explained it must therefore be a plot by the gov't or some arm thereof.
You're entitled to believe as you wish, of course, but as far as I'm concerned the Conspiracy Theories leave alot to be desired when it comes to some of the afore mentioned paragraphs.