Demolition would not be done with sprinkled Pixy Dust. It would take a lot of material and equipment to do it. It would need to be prepared in buildings that were occupied by tens of thousands of people. Many of them 24/7.
What kind of detonating devises were used? Radio signals ? In a city of 10 million people with millions upon millions of radio signals being sent at all times. The chances for accidental detonation would be tremendous.
What ever was used would have had to stand up to an hour and a half of being covered by burning jet fuel and office furnishings.
Finally. WHY! Two 767s with hundreds of innocent passengers and crew vaporized! Thousands of people killed. Two iconic American buildings in flames. The Pentagon and either the White House or the Capital building destroyed.
That wouldn't have been shock enough?
I don't debate cut & paste Conspiracy Theories. If someone wants to present their opinion of what happened----I'm game.