There is no physical evidence whatsoever that fire caused those collapses.
Add to that the fact that the NIST couldn't get their model to produce the alleged south wall bowing and had to add artificial forces. Even then they don't show the loads required to collapse the east and west walls and remaining north wall of WTC 1. Nobody could get away with this in industry, they would be thrown out of a design review.
Add to that the fact that there is no evidence of the dynamic load that Dr. Bazant simply presumed there was, to cause propagation. It is understandable as to why he would say this, because he knew a dynamic load was necessary for a natural collapse which he had no reason to doubt at the time. However, we have since learned that there wasn't one.
Finally , the present official causes for the collapses are not backed by any evidence at all, yet all I hear from some here is that the collapses have been explained. That is pure unadulterated baloney and it seems many here are the ones who are actually guilty of Ryan's "Irreducible Delusion", including Ryan himself.