The conceptual evolution of visitors from space has centred on the notion of vehicle of travel. Early uptake saw some utterly simplistic notions and designs that came to form the bedrock of ufology. These concepts were, during their time, deemed advanced, novel, otherworldly. But viewed from our standpoint two or three generations later, thy appear positively childlike and contrived. Look back at the pictures of these flying saucers. It's almost embarrassing.
To match the delusion, our concepts have been subordinated to the plethora of creative science fiction out there today. New and fantastic concepts have given birth to a whole new range of designs which have attempted to transcend our notions of "today's technology".
... What possible value can be argued for inter galactic visitors just coasting around in such a fashion. It's nonsense. Utter pure idiotic nonsense.
The historical evolution of images attributed to flying saucers has evolved both in terms of their outward design and their capability. They proceed in a linear fashion with how we ourselves develop new science fiction based narratives.
To ignore this is self seduction of the worst kind.
Grand solutions, like grand rejections, never seem to fit the data just quite right. The notions of the ever-changing type of object that we see is a fascinating part of the phenomenon. How our interpretations and imaging of the craft have shifted over time do reflect our own technology and imagination of what alien craft, robots or humanoids might look like - that is indeed a specific thread in the UFO tapestry. This has nothing to do with seduction, but is just a function of the limitations of our interpretations of impossible experiences with unknown, wild, external stimuli.
Whether or not we can associate mundane answers to all the images of craft i.e. hoaxes or experimental craft across time is a conundrum, as in some cases the capabilities of the objects are far in advance of human capacity, as opposed to being just a little in front of our current abilities where the terrestrial likelihood of such objects is high. But some of the stories presented to us, and many are daytime, coming in all manner of strange configurations, do not always match the meme of the day. In fact some of the really odd cases seem to fly in the face of news born patterns and suggest anomalous experiences far too difficult & surreal to explain. Speaking as a perennial doubter, i still have to admit the repetition of such absolutely bizarre cases involving multiple witnesses during day and night, with and without lights, indicate that there is in fact something very strange going on. Limiting these experiences to merely lights in the sky is to skim off the easy fat of ufology and has nothing to do with the two types of witnessed events that we have recorded historically.
The many witness cases i've alluded to reside most often in the memory of the witness alone. These cases are strange, surreal, defy logic, but are recorded nonetheless in the minds of the witnesses (Kelly Hopkinsville, Pascagoula, Falcon Lake, Ariel Zimbabwe etc.) and no two are alike, nor are these easily explained. They may or may not fit existing patterns of reported UFO design. It can be argued that these cases are directly influenced of course by the cultural frontloading of the witness - context of the witness is everything when you are trying to describe something you've never seen before.
Then there are other cases that are considered the hardcore cases with radar confirmation, multiple witnesses and interactions that give our military leaders great pause, are concerned mostly with shoulder shrugging and we just remain slack jawed and unable to properly ascertain just what that craft was or where it came from, but "We ain't seen nothin' like it round here before!"( Tehran 1976 and RB-47 are classic examples.) These are not simple cases and have no real mundane explanations at all.
Regarding motive and the ridiculousness of it all, of all those supposed implants, hybridized children, lengthy needles, countless water & soil samples and all the relentless probing, well really, who are we to know the mind of the alien? While i personally find it greatly unlikely that an alien species would ever make its way to earth to stop by, smell the roses, overheat a few cars, abduct some folk, and believe it even more improbable an alien craft has ever crashed in the desert, i still know that the answer to this enduring mystery is not a simple one and can not be explained away by your mere wish. To date history does indicate certain witnessed patterns that are not easily reconciled, and if they're not alien then there's some other, more interesting things happening on this planet that we haven't fully comprehended or have much proof of.
And to be clear, i think it's mostly impossible that aliens have ever abducted anyone, still, i find some of the cases regarding AP and humanoid encounters to be more than just engrossing, but entirely inexplicable (Pier Zanfretta, Westall 1966). There are no easy answers for these cases. I agree that theorists who use research well give us a little headway (Vallee, Clark, Rutkowski) but most of the field is mired with the repetition of known hoaxed and mundane cases which clogs up the vision of the actual intricacy of the entire phenomenon. It has affected people profoundly and suggests that the phenomenon's effect lingers long after the witnessed event. This is not just about delusion, kooks, or misperceptions - it's way more difficult than that.