Jet-A open-air burn temperature maxes out at about 600F.
In order to bend steel easily you need to get up to about 1500F.
It is possible to use kerosene-like fuels to heat steel to working temperatures, provided there is refractory involved.
If you heat a 1" bar of steel to orange heat and put it on an anvil, and swing at it with a 10-lb sledge, you will be able to bend that bar in a controlled fashion.
If you put that orange-hot bar on a hot cut hardy designed for cutting stock, you will need to swing that 10-lb sledge at least 3-4 times (with all your might) to shear it in half.
There is no hand tool in the world you can use to get a 1", 2000F degree steel bar to fail instantly. You need to up the ante to multi-ton three-phase power tools.
Steel does burn. Quite well, actually. You need a shit-ton of oxygen to do it. In the absence of oxygen steel does not burn. It will eventually crumble when it gets up close to 3000 degrees.
Burning also does not cause steel to fail instantly. It slowly eats it away, almost as if it's rusting in fast motion, and pieces of it ablate away.
The structural integrity of the steel erodes over time. A 1" round bar would become roughly 7/8", then 3/4", etc.
I am not a truther, by the way, only a part-time blacksmith.
I'm not quoting engineers. I'm only relating things I have witnessed first hand.
1" bars are NOT structural girders.