Ok, I'll bite (which is what this thread seems to have been started for - to pour scorn on folk who trust no one in power and don't believe everything the media tell them to believe).
Tell Occam to cut these down to a conclusion based on no assumptions....
The Twin Towers' destruction exhibited all of the characteristics of controlled demolition.
Destruction proceeds through the path of greatest resistance at nearly free-fall acceleration
Improbable symmetry of debris distribution
Extremely rapid onset of destruction
Over 100 first responders reported explosions and flashes
Multi-ton steel sections ejected laterally
Massive volume of expanding pyroclastic-like clouds
1200-foot-diameter debris field: no "pancaked" floors found
Isolated explosive ejections 20–40 stories below demolition front
Total building destruction: dismemberment of steel frame
Several tons of molten metal found under all 3 high-rises
Evidence of thermite incendiaries found by FEMA in steel samples
Evidence of explosives found in dust samples
WTC 7 also exhibited characteristics of controlled demolition.
Rapid onset of collapse
Sounds of explosions
Symmetrical structural failure
Free-fall acceleration through the path of what was greatest resistance
Imploded, collapsing completely, landing almost in its own footprint
Massive volume of expanding pyroclastic-like clouds
Corroboration from Danny Jowenko, a European controlled demolition professional
Foreknowledge of "collapse" by media, NYPD, FDNY
The three high-rises exhibited none of the characteristics of destruction by fire:
Slow onset with large visible deformations
Asymmetrical collapse which follows the path of least resistance (laws of conservation of momentum would cause a falling, intact, from the point of plane impact, to the side most damaged by the fires)
Evidence of fire temperatures capable of softening steel
High-rise buildings with much larger, hotter, and longer-lasting fires have never collapsed
And all that is before we get to the fact that live BBC TV rolling news announced the collapse of WTC7 24 minutes before it happened.