Unbelievable. You're equating the witnessing of melted steel at the World Trade Center with seeing ghosts and UFOs. This is incredible.
Are you suggesting that the reports of fire chiefs, structural engineers and ironworkers are somehow less informed that the armchair opinions of anonymous internet bedunkers? Orphia Nay, do you know more about these matters than Richard Garlock, Leslie Robertson, Ahmed Ghoniem, Abolhassan Astaneh-Asl, RJ Lee, and the American Society of Safety Engineers? Do you know more about these matters than they do, Orphia Nay?
But here's an answer to your inane question: if large groups of people, including credible sources, saw these phenomena at the same time and the same place and reported on them publicly, and I wasn't there myself, I would have to give them the benefit of the doubt, for the time being at least. Who am I to say what others saw, when I wasn't even there?