They were also rushed into construction and made loopholes to clear its way building it. Both towers were made in less time than the entirety of the Empire State Building. Notice that no one builds buildings like this anymore since 911 either...

They were structurally deficient because of their simple lego-like design for prefab like assembly and the elevator design was a flaw.

Also you underestimate how explosive jet fuel is. Look up the Germany El-Al accident of a cargo plane loaded with fuel as it took off loaded before crashing. Practically vaporized an apartment complex.