The Facts on UFO’s and other Supernatural Phenomena (Harvest House, 1992), pp. 12-13
Why is the Extraterrestrial Hypothesis (ETH) not credible for explaining the current UFO phenomenon?
…the diversity and behavior of both the craft and the entities in Close Encounter episodes simply do not fit with what we would expect from advanced intergalactic travelers. If we include abduction and contactee experiences, it becomes virtually impossible to believe in the ETH. The psychology and bizarre actions of the entities more fit the demons of old, not a technically advanced and highly rational form of extraterrestrial life. (cf. Jacques Vallee Passport to Magonia: From Folklore to Flying Saucers (Chicago: Henry Regnery), 1969)
Is it reasonable to think there would be no body of evidence whatever to prove that great numbers of alien physical craft are crisscrossing the skies? Is it conceivable that in the last 50 years there have been thousands (or, as some researchers have postulated, millions), of different crafts circling the earth simultaneously from the thousands of different places in the universe? Where is the proof?…
In fact, were it not for the widespread hope of human contact with extraterrestrials, the idea the UFOs represent interstellar craft would be long forgotten. We think there is only one reason why the Extraterrestrial Hypothesis is widely accepted: because so many people want to believe it. The evidence for it is not only lacking, but its flaws are fatal.