So when other tall bldgs experienced fires that were unfought, the bldg collapsed? Or are you just making an assumption that this is what would happen?
To add to Grizzly's response, you can also turn this typical truther pretzel logic on itself:
There are examples of controlled demolitions which have failed (there's a really funny one where the entire building rolls upside down).
Using Truther Logic,
if one had only seen one of these unsuccessful demolitions, you could argue that all buildings would behave the same way.
Of course it's not true in either case - Not all demolitions are identical: neither the methods nor the buildings are identical, so they do not behave the same way. Some work, others don't.
The favorite truther examples, like the Madrid building, are NOT the same kinds of structures that the WTC buildings were. There is no reason to expect them to behave in an identical way.
Red, are you listening?
Severe fires in tall steel-frame buildings are fairly rare, which makes for a small sample size, and finding a comparative sample for the WTC buildings is impossible - they were unique designs, and suffered unique damage.
If, by some fluke, another building with identical construction to WTC7 was somehow compromised in exactly the same way and DIDN'T collapse, then we'd have something concrete to go on. But we don't.
For those reasons alone, Red, your argument fails. It is an overly-simplistic idea, based on inadequate data. It is a faulty generalization.
Truthers, as believers in any number of conspiracy theories, tend to conflate those conspiracies together thinking that the pattern overrides the individual circumstances. So you get the progression; The Pearl Harbour attack MAY have been a LIHOP/the JFK assassination MAY have been a deeper conspiracy/George W Bush mislead the public about WMD's in Iraq, therefore he must have planned the 9/11 attacks or been part of a conspiracy to carry them out (LIHOP/MIHOP).
The problem is, none of those conspiracy allegations are proven, they're all conjecture....except for the part about Bush misleading the public about Iraq.
My truther colleague is all hot and bothered about the 'Global Warming Swindle' these days. So when you try to talk about WTC, he just replies, 'they're lying about global warming too!!'. And on it goes....