Well, actually...a visual simulation of the WTC collapses would be a good first step. You know... it's only one of the most unique and mysterious structural failures in the history of the world... it would be nice if they (NIST) took the time to demonstrate their theories.
Well actually, no it wouldn't.
NIST isn't actually talking to people such as you, they are talking to professionals within the construction industry.
Provided that the calculations and modelling which NIST has done are accepted by those professionals then there is no need for further exposition.
Just because you lack the imagination and technical expertise to understand what you are being told does not mean that you have a right to have it simplified for you. NIST isn't in the entertainment business and the collapse of the WTC towers on 9/11, along with the deaths of innocent people, is not a suitable subject for your amusement.