Why UFOs

s/t: An exhaustive study of unidentified flying objects revealing their source & the forces that control them
Operation Trojan Horse is essential for any student of the occult. Keel's brilliant ultraterrestrial hypothesis needs to be read...albeit, with the proverbial grain of salt.
Shortly after the 1970 version of this book was published, Keel was not only "contacted" by the subjects of his research--they refused to leave him alone! As a result he was driven insane. This is most clearly evident in his later work, The Eighth Tower. A few of Keel's other works (This Haunted Planet & The Mothman Prophecies) are noteworthy, but not in the same class as OTH.
The opinion of the ultraterrestrials regarding this book seems to have been, "He wrote WHAT? Oh, no--can't have that! Let's put him at the top of our list of folks who need to be f**ked with." The 1st edition almost didn't see print. A 2nd edition was never published until this revised edition came out in the late '90s. Meanwhile, between Keel stating things like, "God is insane, & an ancient computer keeps sending beams into my head!" (paraphrased from Eighth Tower), & allegations of ultraterrestrial Dopplegangers impersonating him across the land--well, let's say his credibility has suffered.