trainedobserver
Paranormally Disenchanted
"What is the truth that cannot be told?" From the viewpoint of the silence group, it may be a little simpler than that. I think their mantra is, "Scientists, educators and other professionals: do not research the UFO subject. It will damage your career." As we've seen in the past, it may also end your life.
Have things changed in the last decade? Is instant Internet access to information and video frustrating the silence group? Is disclosure "happening every day," as Edgar Mitchell would say? I think so. Now, finally, there are too many voices to silence. Even the former Governor of Arizona says he witnessed the giant boomerang that flew over Phoenix in 1997. With a DSL wire attached to the back of our PC, we have the power to change minds around the world in real time. Viva la Paracast.
I think there is a promotional group. I think there are versions of the UFO myth that get promoted and encouraged by agencies and individuals who have used it to mask a wide variety of activities over the years. By careful manipulation of everything from the terms used to describe it to the infiltration of civilian organizations investigating it like NICAP, the public perception of UFOs seems to be at times intentionally diverted and channeled this way and that. The true motivation for this obfuscation is the subject of much speculation of course but it seems to be strategic in nature. A level of confusion and fantasy is actively maintained effectively diverting attention and energy from serious efforts to understand what are unarguably real world events involving real world objects of a highly mysterious and inexplicable nature to the public. The Internet, with its legions of hoaxers, would-be investigators, and deluded keyboard operators is just as much an impediment to that investigation as it is a boon. The Internet is an endless regurgitation of long-ago debunked nonsense that gets recycled and sent back through like some idiotic email chain-letter endlessly circulating the globe filing up disk drives with literal garbage. Just think Moonship UFO for an example of what I'm talking about.
The terrible secret that cannot be told could be something so reality breaking that the uninitiated have little chance of coping with it (such as we are the livestock of another species or some such) or it could simply be that the military and civilian government are powerless to cope with the UFO phenomena in any real sense and are shy about advertising it.