Can Fuel-Laden Wings Cut Through Steel Beams?

A computer model says they can, but not empty ones:

The new simulation has already shed light on one of the darker mysteries of the attacks: how the extremely light aluminum of the plane wings could have sliced through the heavier steel of the exterior columns like knives. Dr. Sadek finds that without the mass of fuel-laden tanks in the wings, they might not have been able to cut through and do such grievous damage inside.

In several of the computer runs, Dr. Sadek said, "we did not observe any fracture of the column in the case when the wing did not have any fuel."

Interesting. Let's hope Sadek was being honest and not trying to force the official result from his simulation. The computer models certainly SOUND detailed, but how are they verifying their models? If they fit the official story?

Certainly fuel in the wings will add more mass, and more impact force to the WTC outer columns. But the fuel will not make the wing stronger, just heavier.

I still maintain the wings would have split open on the outer columns, spewing the fuel, and igniting a huge fireball.

Which clearly did not happen for the South tower.

Is this because fuel-laden wings can cut through steel?

Or because no 767 smashed into the South tower wall?