During the eighties and nineties, I was very much a fan of James Randi. James Randi and the skeptics movement were honest and competent investigators of paranormal claims, going after fraud and incompetence. Unfortunately things began to change, I think in the mid-nineties.
I recall two things in particular: a logic-free rant appearing in "The Skeptical Inquirer" about OJ Simpson's acquital for murder, and their general dismissal the "Gulf War Syndrome", the term collectively applied to various symptoms many veterans of the first Gulf War experienced.
These days, they may still be competent regarding the paranormal investigation, but they are definitely incompetent at understanding the most basic concepts involving 9/11. James Randi called me a nutcase when I called on him to denounce numerous examples of flim-flim (the title of one of his eighties books) in the official 9/11 story. (No link; it was private communication.)
This thread indicates the extreme difficulty of getting them to comprehend the obvious: Popular Mechanics was nuts when it told us that Air Traffic Control had to search the entire country for a plane whose transponder was turned off. (If the plane is in New York at the time, it won't have gone very far in the next five minutes.) Popular Mechanics's claim was a phony explanation for the paralysis of NORAD during 9/11.
Nevertheless, in a vain hope against hope, I posted (at the end of a thread from two years ago about this topic) a call for signatures in the petition to investigate the inconsistant take-off times.