I've always enjoyed listening to Whitley Strieber far more than most of his innumerable Dreamland guests; they can't hold a candle to him intellectually, or for sheer story-telling ability. To me, Whitley Strieber's world is much like his writing: true fiction, or fictive reality. His experiences seem to exist in a nether-world that adjoins our consensus reality; seemingly physical, but not quite. Like the UFOs that he associates with his experiences, they leave nothing more substantial than traces--cigarette butts, broken twigs, footprints, and a surrealistic landscape of high strangeness.
Strieber makes a compelling case for the existence of "hybrids," or human-alien offspring. He recounted a couple of past encounters with what he considered hybrids on Coast that were quite remarkable.... and I don't think he's discussed these encounters before. I have no doubt that he witnessed what he described witnessing; and similar encounters with strange, quasi-human entities have been related by other experiencers. However, like much of lore associated with the UFO experience, there's been quite a bit of contamination and disinformation associated with the subject of "hybrids." Some UFO researchers (such as David Jacobs) have built entire careers on the threat of a hybridized human race infiltrating the planet. So, while I have no doubt that people have encountered non-human (but human-appearing) beings of some sort, and while there are credible accounts that such beings reside on this planet, I don't think that we yet know what these beings are, or where they come from--much less what agenda they might have. Despite insistent prodding by George Noory, Strieber refused to speculate on this, to his credit.
Strieber's accounts reminded me of the very strange but fascinating Ingo Swann book Penetration. This book is long out of print and $$$, but digital copies of it can be found on file sharing sites. The copy that I have suggests a book that was hastily written, carelessly edited, and privately published; it's littered with misspellings, and many of its arguments (the primary one, that Earth's moon has a substantial atmosphere) are demonstrably false and traipse too close to George Adamski territory. I'd almost regard the book as fiction, but it was published as fact. Despite the book's factual errors and improbable story, after finishing it I had the strong hunch that it was "true" in that unquantifiable way that we find many vivid dreams to be "true." And the fact that it seems carelessly compiled--rather than professionally published--adds strange credibility to it, in my opinion. It's almost as if Swann decided, "You probably aren't going to believe any of this, but I'm throwing it out to you anyway."
The book's recurring thesis--that there is an alien base on the dark side of the moon--appears too often in various texts and accounts to be ignored. And Swann's encounter with a beautiful, dark-haired, voluptuous but ultimately malignant "alien" in the supermarket (page 45 in my edition) reminds me of Strieber'a accounts on Coast. After this encounter, there's discussion of what these entities are--bio-androids? extraterrestrials?--and why they are here. Ultimately, one of Swann's characters concludes, "They're dangerous, you know, and they realize that Earth psychics are their only enemies"--because only those who are "psychic" can actually "see" them for what they are.
I have no doubt that Whitley Strieber fits the definition of a classic, intuitive "psychic," and that is why these beings appear, essentially, to him, and almost never to anyone else around him (and only to others when Strieber is present). The entities are not fully part of our consensus reality; yet they are definitely experienced by certain intuitive people, who instantly detect them as malignant, threatening, and so different from us as to be "alien." My hunch--for what it's worth--is that their primary level of existence is what metaphysicists call the near-astral level, that quasi-physical realm that blends with and mirrors our physical world, but is essentially invisible to most. Yet, they are not ghosts, but rather evidence of a tangible society of beings that have some technological achievement. Their world is quite physical, to them, but to us--when we see them--their occupants and their machinery appear as ghost images, bizarre craft, and malignant quasi-human beings that obey an inner logic alien to us.
While we pat ourselves on the back with our current technical prowess and abilities to make the invisible, visible, it may be that the broad landscape of the non-physical has not yet been scientifically discovered, but is about to be.... and the presence of the "hybrids" suggests that this discovery is coming sooner, rather than later.