I really don't think that these conspiracy theories serve any purpose whatsoever - the contention in the last video, that explosives were used to bring down the twin towers, is clearly nonsense. Even from just watching the first couple of minutes, is it not stark-staringly obvious that no explosives were necessary to bring down the towers? Is it not an almighty coincidince that the alleged seat of these explosions happens to be in exactly the same loci as where the planes crashed into the buildings?? You can parade as many eyewitnesses as you like, but it doesn't change the facts of what actually happened. The general claim seems to be along the lines of 'if you want to bring the tower down completely, explosives must have been used' - but even a cursory glance at the footage shows that the buildings did indeed collapse from the top down - you can see that the lower section of the 2nd tower for example is completely intact as the upper section is coming down on top of it.... there were no explosions lower down, therefore if there were any explosions at all, they must have been atleast as high up as where the planes hit. Therefore, quite why anybody feels the need to speculate that explosives were used is beyond me - is a passenger jet fully laden with fuel and slammed into the middle of a skyscraper not explosive enough?