There are different kinds of rivets, some of which have to be of soft enough material to deform and lock them into place. That doesn't mean they are "soft," it means that they are not made of the same kind of steel as the girders.

The burning jet fuel did not melt rivets and girders all by itself. It ignited fires in all kinds of material in the buildings (NOT just a few wastebaskets!!). And when the first few rivets and other fasteners let go, some of the girders on upper floors started to sag, adding further stress, then eventually let go, starting the "pancaking effect."

In any case, a 65 ton airliner carrying as much as 10,000 gallons of fuel impacting a tall building at some 300 mph or more is going to do a bit more damage than just leaving a bruise!

The impact was such that parts of the aircraft went clear through the buildings and out the other side. At least one engine was found several blocks away.

There is a helluva lot of detail available for anyone who wants to spend a little time researching it. I'm too busy today to try to see to peoples' education. I suggest that you Google "World Trade Center Destruction" and look over what comes up. There's a LOT of information there, much of it highly detailed.

In any case, the conspiracy theory version of the thing simply doesn't hold water for a host of reason.

As most conspiracy theories don't when closely examined.

Don Firth