A building fire started by jet fuel absolutely can melt steel beams, and the collapse of building 7 occurred exactly as you would expect from a building fire, which happened because the fire in the other buildings was blown across by the wind and explosions. None of the building collapse videos look like a demolition.
If the government wanted to execute an attack on Americans, why not just fund the terrorists and ignore warnings? Let the jihadists crash planes into buuldings. Setting hidden, controlled demolition charges and trying to make it look like a collapse is harder than finding some terrorists willing to die for their cause and teaching them to fly.
It is conceivable to me that members of the intelligence community, the military-industrial complex, and/or the government ignored warnings and allowed the attacks to happen for their own benefit. I would prefer to think it wasn’t true, but I must concede that it would explain many inconsistencies.
It is theoretically possible, but implausible to me, that those same people would coordinate the attacks and support the terrorists to ensure that the attacks would happen as a false flag operation. This is an extraordinary claim with almost no evidence.
It is not in any way possible that the government demolished any of the buildings attacked on purpose and then covered up all evidence of the demolition. There would need to be too many people involved, too many videos altered or destroyed, and too much evidence planted after the fact. It is demonstrably false.