Hypothese 1: Persons, who state to have been abducted by UFOs, are psychologically ill, or they are frustrated of life and they project these problems into any extraterrestial threats, which they took from Science Fiction films like "Close Encounter of the third Kind" or "X-Files".
It is clear that such people exist, and they point us out that our current society missed it to arrange sufficient safety feeling and reliable values for the citizens. Nevertheless the problem cannot be explained as a whole this way.
On the one hand reports about "UFO" experiences are older than the films mentioned. The film directors and film script authors oriented themselves at the experience reports of humans, in reverse.
On the other hand extensive psychological studies, particularly in the USA, performed by qualified psychologists and psychiatrists (e.g. Professor John Mack of Harvard University), did not result a typical psychological profile for "the typical UFO abductee" and also no characteristic symptomes of disease.
In our own documents is a multiplicity of examples of people with UFO experiences - who didn't know anything about UFOs before, who never could believe to be affected themselves by such an experience, but came to us with quite different problems, - people standing firmly in life with both legs, who are successful in their business - and became conscious of the experience mentioned only during the process of the search for the causes of their problems in hypnosis.
Of course each hypnotherapist knows about the fact that statements in hypnosis are not necessarily objective facts. This leads to a further sceptics argument, that you may find here.