[Not Fooled]

The object in question is more if that was the intent, and if they knew that. Personally I think whoever is responsible got more of a result than they ever expected.

How is the structure weaker at the top? The only explanation I can think of is the asbestos issue, which I don't know to be true or not. Would there be extra support columns in the lower portions that did not extend to the higher leves?

[ScholarWarrior]

Absolutely lighter and less rigid as you go up.
It has to be, otherwise it does not sway, and therefore could not withstand the wind shear.
Think pine tree.