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To address the melting point, in the official report done by FEMA they reported finding puddles of melted steel (tested to be the same alloy as the steel used in the frame of the building, and nothing else in the building had that alloy of steel). Also, the buildings structural failure was complete at almost the exact same time over each floor, even in the case of a tube within a tube design. One floor completly gave all at the same time, then the next, then the next. The problem with that is that when steel weakens from a fire in a building, all the steel does not deform or lose its strength at the same rate. It's so improbable that in 10 million fires it would only happen once.
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