Thank you, Baker!
Ever use a cutting torch? Do you think thermite makes a smooth cut?
Symbolism. He was telling a story to children, much like what they think they did to all of us.
I've worked with steel enough alongside welders and iron workers to recognize slag from a cut. Not to mention the probability of three large buildings falling perfectly into their footprints on the same day. One of those mathematical coincidences that I keep hearing about. I firmly believe 9/11 will remain in the 40% we'll never know, at least in our lifetimes.