Let's put something in perspective here: Right when the news flashed on CNN that planes were crashed into WTC by terrorists, everyone was glued to their TVs. Now when the Towers started to collapse, the first thing that came to mind was "Hey, no way a building could crumble on itself like that. That looks like a demolition job!".
And yes, it was clearly a demolition job. The buildings crumbled as if the entire support beams of the structure did not function like they were designed to do. Can you imagine pila ka kabilyan ug mga puthaw gigamit anang buildinga? Nya gi-compute pa gyud na dapat madaug niya ang iyang gi-alsa no matter unsa kakusog sa supertyphoons na moagi nila. I would even wager na even ang fire is already considered in the construction materials used.
Pero since nobody could pinpoint the culprits, and no one is stepping up to testify either, this is why this is still labeled as a "conspiracy" til now. Even if it was very obvious, this is all speculation because you can't prove that explosives were used because nobody is willing to step up. (Laliman pud uroy ka mo-testigo adtong mga tawhana... puro man to mga bug-at kaayo)
Pero I also believe in time someone will crack and come out of the shadows to tell us what really transpired that day.
So, there -- technically, this is subject is still a conspiracy.