Maybe it could lead to widescale collapse. I'm not debating that.
Actually, you'll find that you have stated several times that fire-induced failure of steel structures isn't possible.
I'm telling you that the WTC did not collapse at all and that what really happened is that it got turned into dust while it was standing there.
So, although we know that fire can cause collapse and that an aircraft impact can cause major damage, we are to dismiss the probability that these are the initiating events. We are instead to believe that an a-yet unknown DEW, which you cannot prove exists, in some manor vaporised or dustified the steelwork.
Did any steel building have this happen to it, under any circumstances of fire? Airplanes have crashed into buildings, and nothing like this happened, and plus you could find the airplane after it was all over. Doesn't make sense.
Can you find me an example of a modern wide-bodied passenger jet crashing into the upper stories of a tall (i.e. in excess of, say, 40 storey) steel framed building?
And finally, as others have pointed out, we seem to have some rather largish pieces of aeroplane left over.
I have to agree with the others. You're either yanking our chain, to use an Americanism, or you're seriously ill and simply can't see your delusions for the fantasies that they are. There will be no more from me until you post anything of substance and meaning.