I'll pose a different question. What if it didnt work?
The US govt actually signed off on doing TWO controlled demolitions that have never been attempted on buildings a fraction of the size, live without a net in front of the entire world and they had to do it on the fly with no testing, .dry runs, staging.
They somehow managed to load two of the biggest structures in the world with sufficient demolition to collapse them, managed to make it transparent, and flying two jets into the side of the buildings for dramatic effect. And this had no effect what would be the largest controlled demolition in history, by far. And it had to work flawlessy, Twice....or it would be the biggest scandal in the history of the world.
I think cooler heads would have prevailed in that cabinet meeting