The Nova program showed experts going through piles of WTC wreckage to find and mark and recover for analysis structural metal from the collision area.

So where is this material, and why aren't we being shown the results of the analyses? Seems like it wouldn't be too difficult to put all of this speculation to rest simply by providing the material to several different independent testing agencies and publish the results publicly. Or even better, make the material available to anyone who wants to study and test it, and subject any results that are published to peer review. Just like we do for any other kind of science.

And while we're at it, it wouldn't be too difficult for the government to release the video footage of the Pentagon that was taken by the security cameras of the hotel across the road (which was confiscated by the FBI), so people can see for themselves that what crashed into the Pentagon was what the official whitewash says it was.

And although your experience has been that sometimes whistle blowers don't get fired, I don't think you could possibly be suggesting that they never do.