Except we have offered an explanation.
And, besides, just looking suspicious does not mean something is malicious.
I probably should have wrote this sooner, but whatever anyone believes happened on 9/11 the presence of molten steel is the result of something malicious. I mean if you believe Islamic terrorists flew planes into the building under the direction of OBL, that is certainly a malicious act, which caused the molten steel. So to be completely technical that would answer your OP, but I know that is not what you meant.
I contend the presence of molten steel that can't be explained, gives rise to suspicion, that something other then the official story is what happened.
Now in regards to your furnace, I see you withdrew your sure to Oystein's doubt that it was there, that's fine. Let me just ask a basic question, why do you think the fire would have gotten that much hotter when it was in debris, as opposed to when the building was standing up? I mean the source of fuel is the same. I would think that oxygen supply would be the same. I know you can say insulation, but I can easily counter with the smothering affect the debris would call. So why do you believe that in debris the temperature would be so much higher?
Oh no! That deadly surface preperation paint has some of the same chemicals in as thermite (or NANO thermite, or NanuNanu Thermite if you say it like Mork). Dear god! Other stuff uses the same ingredients in entirely different quantities for other purposes?