Strieber is strictly fiction although sometimes compelling. There are only a few non fiction works on this subject by authors such as Paul Hill , Dr.Mack(Harvard) , Allen Hynek ... I have Mack's pre release edition that contain the actual names. I have met with Hynek and associates shortly before his death by brain tumor. I was a clinical hypnotist for 12 years but donated time to people who had difficulty reconciling their experience. In 1977 I participated in radio shows on the subject of civilian facts vs. military denials of ufos.As far as the abduction experience I am certain the large numbers you are quoting are the result of people misinterpreting normal sleep paralysis and/or natural DMT firings in the brain while sleeping.
Regarding the UFO experience , there is extraordinary evidence . There is also a culturally trained derision of the subject .