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If you really believe the Twin Towers couldn't have collapsed without pre-planted demolitions/missiles/whatever, go ahead and google "how the twin towers collapsed", and educate yourself.
Structural engineers and architects understand precisely how the towers collapsed. There's nothing mysterious about it.
And there's the perception problem in a nutshell. The idea of structural failure is boring; the notion of demo crews planting explosives in the middle of the night is thrilling. Government ineptitude is boring; government "conspiracies" are sexy.
Are our lives really so dull and unfulfilled that we have to make this other stuff up? Guess so.