This is a very sensitive issue. When you talk about someone dyeing we naturally try to be very respectful of the deceased and their families.
Conversely the science of structural integrity tends to be a fairly dispassionate subject.
It's hard to mix the two.
To say that the fire was hot enough to make someone jump but not hot enough to melt steel tend to make the messenger seem insensitive, but, none the less, the science is obvious.
When truthers use this example, it is really our attempt to overstate the obvious.
The reality is, even if the fires had reached 2800F, the melting point of steel. causing the upper part of the building to collapse on to the lower part, there would still not be enough mass or energy for it to crush the lower, much stronger part of the building in to a fine dust at near free-fall acceleration.
My heart goes out to all the victims of 911 and their families. And my heart goes out to America, who's liberties have been under attack from within since 911.