So, in summary, this is a person who had very high levels of access to exactly the sort of documents that might indicate this sort of thing, he&#x27;s a person <i>searching</i> for UFOs and UFO information so he might also tease out a pattern in suppressed information in these very high-level documents, and he&#x27;s got literally nothing the rest of us haven&#x27;t got.<p>The eternal-conspiracy answer is that there&#x27;s an enormous coverup that knew he was interested and planned in advance that despite or because of this interest they would engage in a complicated dance in which they merely <i>appeared</i> to give him very high level access to government documents, but somehow completely sealed away all the evidence that would have led him to the putative truth (presumably dedicating untold thousands of man hours to this task, using their presumed army of informed people who still not a one of them ever leak the secret in any way), and then deliberately allowed him out into the public to say that despite his hopes he could find no evidence of aliens, to continue the coverup of the existence of aliens that still doesn&#x27;t seem to be of particular benefit to anyone.<p>Alternatively, there really aren&#x27;t any UFOs, because UFOs are uniquely a product of a 20th-century media portrayals, and if there really <i>were</i> aliens among us, they wouldn&#x27;t be flying around in large primitive aircraft and occasionally crashing, they&#x27;d be a dusting of nanotechnology so sophisticated that it could quite likely edit out our own perceptions of the technology in real time. Because even though the latter may <i>sound</i> more fantastical at first, it&#x27;s actually a plausible possibility of a high-level Kardashev 1+ civilization, whereas flying around in huge physical aircraft is just an unbelievably silly thing for a sophisticated alien race to do, now that we know much more about the limits of technology.<p>(Even we humans, with 21st century technology, do not have a purpose in flying around in low-flying craft that occasionally crash. We use satellites, or tap oceanic fiber cables, or fly in very <i>high</i> craft and use optics, or do any of dozens of far more sensible things, and we <i>aren&#x27;t</i> a Kardeshev 1+ civilization.)