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Because there was some legit sketchy shit:
Bush was warned at least a month in advance that an attack was coming. He deliberately did nothing. This was documented publicly in a Senate hearing afterwards. We don't know whether he did nothing because of incompetence or malice, and we don't know who else knew in advance as well, but either way, at least he and the people who briefed him knew.
The dirty secret of skyscrapers is that they're mostly made of nothing. They're almost entirely air. It takes precious little to weaken them and bring them down. The Bin Laden family was in the construction business and they knew this fact very well.
As others have noted in the thread, Bin Laden and the Muhjadeen had been funded, trained, and armed by the USA. They were our creation.
Usually when people are suspicious, they're right to be suspicious. They're not always right about what to be suspicious about.
I would argue that an airliner filled with tons of fuel is not "little". That was a lot of mass moving really fast into the towers. Even then, it took a while for the structures to become weak enough to collapse. Given the circumstances, it was amazing the towers lasted as long as they did after they were hit.
Your core description is correct though: There really isn't much to skyscrapers.
Rebar and concrete
I think that is generally for the floor of each level and for the actual foundation of the structure itself.
The bulk of the primary structure core is just steel, I think. Skyscrapers need to bend and flex with the wind or during earthquakes. (I am not an architect, but I have watched a few TV shows about this stuff in the past. I think.)