Nobody can be expert on everything. And to examine the whole 9/11 issue, several things, and in separate areas of expertise have to be included. Otherwise it will be like the blind men examining an elephant and one of them says that the elephant is like a snake (feeling the trunk) while the next man says that the elephant is like a tree (touching on of the legs).
That's why the design or, as the case may be, analysis of a building such as WTC requires a multi-disciplinary team. However that's not the point we're discussing, is it?
What we're covering is your stated reluctance to consider technical issues in any depth. So, for example, you state blithely that the building is designed with a FoS of between 3 and 10 and hence collapse is impossible but - when pushed - can't acutally cite a valid source or provide a calculation for same.
If I may provide a Biblican analogy, your house does rather appear to be built on sad. And possibly made out of papier mache to boot.

