And don't forget that the impact of the planes would have detonated explosives, cut detonation cords, displaced explosives, etc.
This is so ridiculous.
You have a good point about the impact of the plane and the fires setting off some explosives. Could you really tell that no explosives went off when the planes hit the buildings? Do you think the molten metal dripping from the tower is odd? How do you get molten metal from a uncontrolled fire in under 2 hours?
Dentonation cords are not necessarily needed anymore as tiny remote units are often used. These devices where surprisingly small when I saw them and not every floor would need to be set. The lower floors and the basement being most important in allowing such a collapse as well as the main seperations floors (not sure what they were called -observatory decks?) You can see them from the outside of the building, 3 or 4 slightly off colored floors. ( Do a search for WTC blueprints)
I won't go as far to say I know there were explosives in the building but the evidence indicates to me there was..and no other theory makes more sense.