'A guy said so', and 'some people heard explosions' -- that isn't evidence. That's a guy talking and some people, under very adverse conditions, mistaking the explosive outgassing of the entire air content of that building for a 'demolition'. Proof, real proof, would involve at least some of the following:

* Explosives detected from traces (there has been none detected)
* Witnesses seeing the installers tearing out the walls to plant demolitions
* Surveillance footage of the installers doing their work
* Admission of guilt from someone (we do have that, Osama admitted it)
* A whistleblower in the conspiracy. Anyone who had evidence of a government conspiracy would make millions blowing the whistle.

There is none of that, there is zero actual evidence of any government conspiracy, and zero evidence that there was controlled demolition -- which makes sense, because 20 people tearing walls out of the building and planting explosives for a couple of weeks would undoubtedly have attracted attention.

There are paranoid people spouting unsubstantiated BS (some of them for monetary gain, like Jones), but that's all there is. Unsubstantiated BS is apparently enough for the less educated members of society, which is both interesting and unfortunate, but for the rest of us, well, we require real evidence.