regardless of how explosives/thermite got into the building, common sense should tell you that a small, localized office fire will not send a modern steel frame skyscraper into free fall.
Not only that, but every building by the same design should be evacuated and demolished, because the design is so unsafe as to be inferior to structures 50 or more years their senior.
How many buildings similar in size and construction to WTC7 have structurally failed and collapsed because of fire? Anyone?
i dont know, did they? for buildings that size? and logic indicates that if they fell the same way, the debris should pile up the same way. Otherwise, whats the point of making them fall the same way?