You can read my criticisms of NIST's WTC 1 and 2 report in my
whitepaper. I devote an entire chapter to contrasting the different approaches and results, along with my specific criticisms. Another chapter covers scientific progress after NIST finished its report. And I treat in-depth criticism from Eric Douglas in detail, agreeing with a good portion of it.
But these are just details. Think of it like this: Suppose one research team decides the average American male is 175 cm tall. Another team decides the correct answer is 178 cm. And then the Truthers claim that since the teams don't agree, their own guess that the real figure is 6,252 cm is just as valid.
The microspheres, melted metal, etc., these details have obvious and simple explanations. The only reason Truthers dwell on them is because, through repetition, they've found things that other people are less likely to have heard of, and makes Truthers sound the least idiotic at first blush. It's just what they do. No need to worry, that is also
all that they do.