Take a close look at the manner in which WTC 7 collapses straight down. For the building to collapse in this fashion, all of the load bearing supports would have had to fail at exactly the same time.
The claim that the collapse was the result of a fire requires the fire be equally distributed throughout the entire floor of the building, providing equal heat for an equal amount of time, so that all the load bearings members would fail at the exact same moment.
Do you find this plausible?