The proponents of these craps are merely those who believe UFOs are real. Scientists and skeptic organizations such as the Committee for Skeptical Inquiry have provided prosaic explanations for a large number of claimed UFOs being caused by natural phenomena, human technology, deceptions, errors, delusions, or hoaxes. Small but vocal groups of "ufologists" which i call mad folks Favour unconventional, pseudoscientific hypotheses, some of which go beyond the typical extraterrestrial visitation claims and sometimes form part of new religions.
UFOs generally comes to human perceptions due to psychological effects (pareidolia, suggestibility and false memories, mass psychogenic disorders, optical illusions, and hallucinations. Same thing goes to the concept of UFOs and aliens. In reality it is a myth or hoax